Install Linux Virtual Delivery Agent for Debian

You can choose to follow the steps in this article for manual installation or use easy install for automatic installation and configuration. Easy install saves time and labor and is less error-prone than the manual installation.

Note:

Use easy install only for fresh installations. Do not use easy install to update an existing installation.

Step 1: Prepare Debian for VDA installation

Step 1a: Verify the network configuration

We recommend that the network is connected and configured correctly before proceeding.

Step 1b: Set the host name

To ensure that the host name of the machine is reported correctly, change the /etc/hostname file to contain only the host name of the machine.

hostname

Step 1c: Assign a loopback address to the host name

Ensure that the DNS domain name and Fully Qualified Domain Name (FQDN) of the machine are reported back correctly. The way is to change the following line of the /etc/hosts file to include the FQDN and host name as the first two entries:

127.0.0.1 hostname-fqdn hostname localhost

For example:

127.0.0.1 vda01.example.com vda01 localhost

Remove any other references to hostname-fqdn or hostname from other entries in the file.

Note:

The Linux VDA currently does not support NetBIOS name truncation. Therefore, the host name must not exceed 15 characters.

Tip:

Use a–z, A–Z, 0–9, and hyphen (-) characters only. Avoid underscores (_), spaces, and other symbols. Do not start a host name with a number and do not end with a hyphen. This rule also applies to Delivery Controller host names.

Step 1d: Check the host name

Verify that the host name is set correctly:

hostname
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This command returns only the host name of the machine and not its FQDN.

Verify that the FQDN is set correctly:

hostname -f
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This command returns the FQDN of the machine.

Step 1e: Disable multicast DNS

The default settings have multicast DNS (mDNS) enabled, which can lead to inconsistent name resolution results.

To disable mDNS, edit /etc/nsswitch.conf and change the line containing:

hosts: files mdns_minimal [NOTFOUND=return] dns

To:

hosts: files dns

Step 1f: Check name resolution and service reachability

Verify that you can resolve the FQDN and ping the domain controller and Delivery Controller:

nslookup domain-controller-fqdn

ping domain-controller-fqdn

nslookup delivery-controller-fqdn

ping delivery-controller-fqdn
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If you cannot resolve the FQDN or ping either of these machines, review the steps before proceeding.

Step 1g: Configure clock synchronization (chrony)

Maintaining accurate clock synchronization between the VDAs, Delivery Controllers and domain controllers is crucial. Hosting the Linux VDA as a virtual machine can cause clock skew problems. For this reason, synchronizing time with a remote time service is preferred.

Install chrony:

apt-get install chrony
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As a root user, edit /etc/chrony/chrony.conf and add a server entry for each remote time server:

server peer1-fqdn-or-ip-address iburst
server peer2-fqdn-or-ip-address iburst

In a typical deployment, synchronize time from the local domain controllers and not directly from public NTP pool servers. Add a server entry for each Active Directory domain controller in the domain.

Remove any other server or pool entries listed including loopback IP address, localhost, and public server *.pool.ntp.org entries.

Save changes and restart the Chrony daemon:

sudo systemctl restart chrony
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Step 1h: Install packages

sudo apt-get install -y libsasl2-2

sudo apt-get install -y libgtk2.0-0
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Step 1i: Add the oldstable repository

To install the necessary dependencies for a Debian distribution, add the deb http://deb.debian.org/debian/ oldstable main line to the /etc/apt/sources.list file.

Step 2: Prepare the hypervisor

Some changes are required when running the Linux VDA as a virtual machine on a supported hypervisor. Make the following changes according to the hypervisor platform in use. No changes are required if you are running the Linux machine on bare metal hardware.

Fix time synchronization on Citrix Hypervisor

When the Citrix Hypervisor Time Sync feature is enabled, within each paravirtualized Linux VM you experience issues with NTP and Citrix Hypervisor, both of which try to manage the system clock. To avoid the clock becoming out of sync with other servers, ensure that the system clock within each Linux guest is synchronized with the NTP. This case requires disabling host time synchronization. No changes are required in HVM mode.

On some Linux distributions, if you are running a paravirtualized Linux kernel with Citrix VM Tools installed, you can check whether the Citrix Hypervisor Time Sync feature is present and enabled from within the Linux VM:

su -

cat /proc/sys/xen/independent_wallclock
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This command returns 0 or 1:

• 0 - The time sync feature is enabled, and must be disabled.
• 1 - The time sync feature is disabled, and no further action is required.

If the /proc/sys/xen/independent_wallclock file is not present, the following steps are not required.

If enabled, disable the time sync feature by writing 1 to the file:

sudo echo 1 > /proc/sys/xen/independent_wallclock
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To make this change permanent and persistent after restart, edit the /etc/sysctl.conf file and add the line:

xen.independent_wallclock = 1

To verify these changes, restart the system:

su -

cat /proc/sys/xen/independent_wallclock
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This command returns the value 1.

Fix time synchronization on Microsoft Hyper-V

Linux VMs with Hyper-V Linux Integration Services installed can use the Hyper-V time synchronization feature to use the host operating system’s time. To ensure that the system clock remains accurate, enable this feature alongside NTP services.

From the management operating system:

1. Open the Hyper-V Manager console.
2. For the settings of a Linux VM, select Integration Services.
3. Ensure that Time synchronization is selected.

Note:

This approach is different from VMware and Citrix Hypervisor, where host time synchronization is disabled to avoid conflicts with NTP. Hyper-V time synchronization can coexist and supplement NTP time synchronization.

Fix time synchronization on ESX and ESXi

When the VMware Time Synchronization feature is enabled, within each paravirtualized Linux VM you experience issues with the NTP and the hypervisor, both of which try to synchronize the system clock. To avoid the clock becoming out of sync with other servers, ensure that the system clock within each Linux guest is synchronized with the NTP. This case requires disabling host time synchronization.

If you are running a paravirtualized Linux kernel with VMware Tools installed:

1. Open the vSphere Client.
2. Edit settings for the Linux VM.
3. In the Virtual Machine Properties dialog, open the Options tab.
4. Select VMware Tools.
5. In the Advanced box, clear Synchronize guest time with host.

Step 3: Add the Linux virtual machine (VM) to the Windows domain

The Linux VDA supports several methods for adding Linux machines to the Active Directory (AD) domain:

• Samba Winbind
• Quest Authentication Service
• Centrify DirectControl
• SSSD
• PBIS

Follow instructions based on your chosen method.

Note:

Session launches might fail when the same user name is used for the local account in the Linux VDA and the account in AD.

Samba Winbind

Install or update the required packages

sudo apt-get install winbind samba libnss-winbind libpam-winbind krb5-config krb5-locales krb5-user
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Enable the Winbind daemon to start on machine startup

The Winbind daemon must be configured to start on machine startup:

sudo systemctl enable winbind
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Note:

Ensure that the winbind script is located under /etc/init.d.

Configure Kerberos

Open /etc/krb5.conf as a root user, and make the following settings:

Note:

Configure Kerberos based on your AD infrastructure. The following settings are meant for the single-domain, single-forest model.

[libdefaults]

default_realm = REALM

dns_lookup_kdc = false

[realms]

REALM = {

admin_server = domain-controller-fqdn

kdc = domain-controller-fqdn

}

[domain_realm]

domain-dns-name = REALM

.domain-dns-name = REALM

The domain-dns-name parameter in this context is the DNS domain name, such as example.com. The REALM is the Kerberos realm name in uppercase, such as EXAMPLE.COM.

Configure Winbind Authentication

Open /etc/samba/smb.conf, and make the following settings:

[global]

workgroup = WORKGROUP

security = ADS

realm = REALM

encrypt passwords = yes

idmap config *:range = 16777216-33554431

winbind trusted domains only = no

kerberos method = secrets and keytab

winbind refresh tickets = yes

template shell = /bin/bash

WORKGROUP is the first field in REALM, and REALM is the Kerberos realm name in uppercase.

Configure nsswitch

Open /etc/nsswitch.conf, and append winbind to the following lines:

passwd: systemd winbind
group: systemd winbind

Join Windows Domain

Your domain controller must be reachable and you must have an Active Directory user account with permissions to add computers to the domain:

sudo net ads join REALM -U user
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Where REALM is the Kerberos realm name in uppercase, and user is a domain user with permissions to add computers to the domain.

Restart Winbind

sudo systemctl restart winbind
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Configure PAM for Winbind

Run the following command and ensure that the Winbind NT/Active Directory authentication and Create home directory on login options are selected:

sudo pam-auth-update
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Tip:

The winbind daemon stays running only if the machine is joined to a domain.

Verify Domain Membership

The Delivery Controller requires that all VDA machines, whether Windows or Linux, have a computer object in Active Directory.

Run the net ads command of Samba to verify that the machine is joined to a domain:

sudo net ads testjoin
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Run the following command to verify extra domain and computer object information:

sudo net ads info
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Verify Kerberos Configuration

To verify that Kerberos is configured correctly for use with the Linux VDA, verify that the system keytab file has been created and contains valid keys:

sudo klist -ke
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This command displays the list of keys available for the various combinations of principal names and cipher suites. Run the Kerberos kinit command to authenticate the machine with the domain controller using these keys:

sudo kinit -k MACHINE\$@REALM
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The machine and realm names must be specified in uppercase. The dollar sign ($) must be escaped with a backslash (\) to prevent shell substitution. In some environments, the DNS domain name is different from the Kerberos realm name. Ensure that the realm name is used. If this command is successful, no output is displayed.

Verify that the TGT ticket for the machine account has been cached using:

sudo klist
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Examine the account details of the machine using:

sudo net ads status
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Verify user authentication

Use the wbinfo tool to verify that domain users can authenticate with the domain:

wbinfo --krb5auth=domain\\username%password
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The domain specified here is the AD domain name, not the Kerberos realm name. For the bash shell, the backslash (\) character must be escaped with another backslash. This command returns a message indicating success or failure.

To verify that the Winbind PAM module is configured correctly, log on to the Linux VDA using a domain user account that has not been used before.

ssh localhost -l domain\\username

id -u
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Note:

To run an SSH command successfully, ensure that SSH is enabled and working properly.

Verify that a corresponding Kerberos credential cache file was created for the uid returned by the id -u command:

ls /tmp/krb5cc_uid
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Verify that the tickets in the user’s Kerberos credential cache are valid and not expired:

klist
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Exit the session.

exit
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A similar test can be performed by logging on to the Gnome or KDE console directly. Proceed to Step 4: Install the Linux VDA after the domain joining verification.

Tip:

If you succeed in user authentication but cannot show your desktop when logging on with a domain account, restart the machine and then try again.

Quest authentication service

Configure Quest on domain controller

Assume that you have installed and configured the Quest software on the Active Directory domain controllers, and have been granted administrative privileges to create computer objects in Active Directory.

Enable domain users to log on to Linux VDA machines

To enable domain users to establish HDX sessions on a Linux VDA machine:

1. In the Active Directory Users and Computers management console, open Active Directory user properties for that user account.
2. Select the Unix Account tab.
3. Check Unix-enabled.
4. Set the Primary GID Number to the group ID of an actual domain user group.

Note:

These instructions are equivalent for setting up domain users for logon using the console, RDP, SSH, or any other remoting protocol.

Configure Quest on Linux VDA

Work around SELinux policy enforcement

The default RHEL environment has SELinux fully enforced. This enforcement interferes with the Unix domain socket IPC mechanisms used by Quest, and prevents domain users from logging on.

The convenient way to work around this issue is to disable SELinux. As a root user, edit /etc/selinux/config and change the SELinux setting:

SELINUX=disabled

This change requires a machine restart:

reboot
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Important:

Use this setting carefully. Reenabling SELinux policy enforcement after disabling can cause a complete lockout, even for the root user and other local users.

Configure VAS daemon

Auto-renewal of Kerberos tickets must be enabled and disconnected. Authentication (offline logon) must be disabled:

sudo /opt/quest/bin/vastool configure vas vasd auto-ticket-renew-interval 32400

sudo /opt/quest/bin/vastool configure vas vas_auth allow-disconnected-auth false
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This command sets the renewal interval to nine hours (32,400 seconds) which is one hour less than the default 10-hour ticket lifetime. Set this parameter to a lower value on systems with a shorter ticket lifetime.

Configure PAM and NSS

To enable domain user logon through HDX and other services such as su, ssh, and RDP, run the following commands to configure PAM and NSS manually:

sudo /opt/quest/bin/vastool configure pam

sudo /opt/quest/bin/vastool configure nss
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Join Windows domain

Join the Linux machine to the Active Directory domain using the Quest vastool command:

sudo /opt/quest/bin/vastool -u user join domain-name
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The user is any domain user with permissions to join computers to the Active Directory domain. The domain-name is the DNS name of the domain, for example, example.com.

Verify domain membership

The Delivery Controller requires that all VDA machines, whether Windows or Linux, have a computer object in Active Directory. To verify that a Quest-joined Linux machine is on the domain:

sudo /opt/quest/bin/vastool info domain
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If the machine is joined to a domain, this command returns the domain name. If the machine is not joined to any domain, the following error appears:

ERROR: No domain could be found.
ERROR: VAS_ERR_CONFIG: at ctx.c:414 in _ctx_init_default_realm
default_realm not configured in vas.conf. Computer may not be joined to domain

Verify user authentication

To verify that Quest can authenticate domain users through PAM, log on to the Linux VDA using a domain user account that has not been used before.

ssh localhost -l domain\\username

id -u
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Verify that a corresponding Kerberos credential cache file was created for the UID returned by the id -u command:

ls /tmp/krb5cc_uid
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Verify that the tickets in the Kerberos credential cache are valid and not expired:

/opt/quest/bin/vastool klist
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Exit the session.

exit
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Proceed to Step 4: Install the Linux VDA after the domain joining verification.

Centrify DirectControl

Join Windows domain

With the Centrify DirectControl Agent installed, join the Linux machine to the Active Directory domain using the Centrify adjoin command:

su –
adjoin -w -V -u user domain-name
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The user parameter is any Active Directory domain user with permissions to join computers to the Active Directory domain. The domain-name parameter is the name of the domain to join the Linux machine to.

Verify domain membership

The Delivery Controller requires that all VDA machines, whether Windows or Linux, have a computer object in Active Directory. To verify that a Centrify-joined Linux machine is on the domain:

su –

adinfo
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Verify that the Joined to domain value is valid and the CentrifyDC mode returns connected. If the mode remains stuck in the starting state, then the Centrify client is experiencing server connection or authentication problems.

More comprehensive system and diagnostic information is available using:

adinfo --sysinfo all

adinfo --diag
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Test connectivity to the various Active Directory and Kerberos services.

adinfo --test
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Proceed to Step 4: Install the Linux VDA after the domain joining verification.

SSSD

Configure Kerberos

Run the following command to install Kerberos:

sudo apt-get install krb5-user
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To configure Kerberos, open /etc/krb5.conf as root and set the parameters:

Note:

Configure Kerberos based on your AD infrastructure. The following settings are meant for the single-domain, single-forest model.

[libdefaults]

default_realm = REALM

dns_lookup_kdc = false

[realms]

REALM = {

admin_server = domain-controller-fqdn

kdc = domain-controller-fqdn

}

[domain_realm]

domain-dns-name = REALM

.domain-dns-name = REALM

The domain-dns-name parameter in this context is the DNS domain name, such as example.com. The REALM is the Kerberos realm name in uppercase, such as EXAMPLE.COM.

Join the domain

SSSD must be configured to use Active Directory as its identity provider and Kerberos for authentication. However, SSSD does not provide AD client functions for joining the domain and managing the system keytab file. You can use adcli, realmd, or Samba instead.

Note:

This section only provides information for adcli and Samba.

Use adcli to join the domain:

Install adcli:

Install the required package:

sudo apt-get install adcli
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Join the domain with adcli:

Remove the old system keytab file and join the domain using:

su -

rm -rf /etc/krb5.keytab

adcli join domain-dns-name -U user -H hostname-fqdn
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The user is a domain user with permissions to add machines to the domain. The hostname-fqdn is the host name in FQDN format for the machine.

The -H option is necessary for adcli to generate SPN in the format of host/hostname-fqdn@REALM, which the Linux VDA requires.

Verify system keytab:

Run the sudo klist -ket command to ensure that the system keytab file has been created.

Verify that the timestamp for each key matches the time the machine was joined to the domain.

Use Samba to join the domain:

Install the package:

sudo apt-get install samba krb5-user
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Configure Samba:

Open /etc/samba/smb.conf, and make the following settings:

[global]

workgroup = WORKGROUP

security = ADS

realm = REALM

client signing = yes

client use spnego = yes

kerberos method = secrets and keytab

WORKGROUP is the first field in REALM, and REALM is the Kerberos realm name in uppercase.

Join the domain with Samba:

Your domain controller must be reachable and you must have a Windows account with permissions to add computers to the domain.

sudo net ads join REALM -U user
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Where REALM is the Kerberos realm name in uppercase, and user is a domain user with permissions to add computers to the domain.

Set up SSSD

Install or update required packages:

Install the required SSSD and configuration packages if not already installed:

sudo apt-get install sssd
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If the packages are already installed, an update is recommended:

sudo apt-get install --only-upgrade sssd
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Note:

By default, the install process in Ubuntu automatically configures nsswitch.conf and the PAM login module.

Configure SSSD

SSSD configuration changes are required before starting the SSSD daemon. For some versions of SSSD, the /etc/sssd/sssd.conf configuration file is not installed by default and must be created manually. As root, either create or open /etc/sssd/sssd.conf and make the following settings:

[sssd]

services = nss, pam

config_file_version = 2

domains = domain-dns-name

[domain/domain-dns-name]

id_provider = ad

access_provider = ad

auth_provider = krb5

krb5_realm = REALM

# Set krb5_renewable_lifetime higher if TGT renew lifetime is longer than 14 days

krb5_renewable_lifetime = 14d

# Set krb5_renew_interval to lower value if TGT ticket lifetime is shorter than 2 hours

krb5_renew_interval = 1h

krb5_ccachedir = /tmp

krb5_ccname_template = FILE:%d/krb5cc_%U

# This ldap_id_mapping setting is also the default value

ldap_id_mapping = true

override_homedir = /home/%d/%u

default_shell = /bin/bash

ad_gpo_map_remote_interactive = +ctxhdx

Note:

ldap_id_mapping is set to true so that SSSD itself takes care of mapping Windows SIDs to Unix UIDs. Otherwise, the Active Directory must be able to provide POSIX extensions. PAM service ctxhdx is added to ad_gpo_map_remote_interactive.

The domain-dns-name parameter in this context is the DNS domain name, such as example.com. The REALM is the Kerberos realm name in uppercase, such as EXAMPLE.COM. There is no requirement to configure the NetBIOS domain name.

For information about the configuration settings, see the man pages for sssd.conf and sssd-ad.

The SSSD daemon requires that the configuration file must have owner read permission only:

sudo chmod 0600 /etc/sssd/sssd.conf
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Start SSSD daemon

Run the following commands to start the SSSD daemon now and to enable the daemon to start upon machine startup:

sudo systemctl start sssd

sudo systemctl enable sssd
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PAM configuration

Run the following command and ensure that the SSS authentication and Create home directory on login options are selected:

sudo pam-auth-update
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Verify domain membership

The Delivery Controller requires that all VDA machines (Windows and Linux VDAs) have a computer object in Active Directory.

Use adcli to verify domain membership:

Show the domain information by running the following command:

sudo adcli info domain-dns-name
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Use Samba to verify domain membership:

Run the net ads command of Samba to verify that the machine is joined to a domain:

sudo net ads testjoin
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Run the following command to verify extra domain and computer object information:

sudo net ads info
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Verify Kerberos configuration

To verify that Kerberos is configured correctly for use with the Linux VDA, verify that the system keytab file has been created and contains valid keys:

sudo klist -ke
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This command displays the list of keys available for the various combinations of principal names and cipher suites. Run the Kerberos kinit command to authenticate the machine with the domain controller using these keys:

sudo kinit -k MACHINE\$@REALM
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The machine and realm names must be specified in uppercase. The dollar sign ($) must be escaped with a backslash (\) to prevent shell substitution. In some environments, the DNS domain name is different from the Kerberos realm name. Ensure that the realm name is used. If this command is successful, no output is displayed.

Verify that the TGT for the machine account has been cached using:

sudo klist
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Verify user authentication

SSSD does not provide a command-line tool for testing authentication directly with the daemon, and can only be done via PAM.

To verify that the SSSD PAM module is configured correctly, log on to the Linux VDA using a domain user account that has not been used before.

ssh localhost -l domain\\username

id -u

klist

exit
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Verify that the Kerberos tickets returned by the klist command are correct for that user and have not expired.

As a root user, verify that a corresponding ticket cache file was created for the uid returned by the previous id -u command:

ls /tmp/krb5cc_uid
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A similar test can be performed by logging on to KDE or Gnome Display Manager. Proceed to Step 4: Install the Linux VDA after the domain joining verification.

PBIS

Download the required PBIS package

For example:

sudo wget https://github.com/BeyondTrust/pbis-open/releases/download/8.8.0/pbis-open-8.8.0.506.linux.x86_64.deb.sh
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Make the PBIS installation script executable

For example:

sudo chmod +x pbis-open-8.8.0.506.linux.x86_64.deb.sh
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Run the PBIS installation script

For example:

sudo sh pbis-open-8.8.0.506.linux.x86_64.deb.sh
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Join Windows domain

Your domain controller must be reachable and you must have an Active Directory user account with permissions to add computers to the domain:

sudo /opt/pbis/bin/domainjoin-cli join domain-name user
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The user is a domain user who has permissions to add computers to the Active Directory domain. The domain-name is the DNS name of the domain, for example, example.com.

Note: To set Bash as the default shell, run the sudo /opt/pbis/bin/config LoginShellTemplate/bin/bash command.

Verify domain membership

The Delivery Controller requires that all VDA machines (Windows and Linux VDAs) have a computer object in Active Directory. To verify that a PBIS-joined Linux machine is on the domain:

/opt/pbis/bin/domainjoin-cli query
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If the machine is joined to a domain, this command returns the information about the currently joined AD domain and OU. Otherwise, only the host name appears.

Verify user authentication

To verify that PBIS can authenticate domain users through PAM, log on to the Linux VDA using a domain user account that has not been used before.

sudo ssh localhost -l domain\\user

id -u
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Verify that a corresponding Kerberos credential cache file was created for the UID returned by the id -u command:

ls /tmp/krb5cc_uid
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Exit the session.

exit
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Proceed to Step 4: Install the Linux VDA after the domain joining verification.

Step 4: Install the Linux VDA

Step 4a: Download the Linux VDA package

Go to the Citrix Virtual Apps and Desktops download page. Expand the appropriate version of Citrix Virtual Apps and Desktops and click Components to download the Linux VDA package that matches your Linux distribution.

Step 4b: Install the Linux VDA

Install the Linux VDA software using the Debian package manager:

sudo dpkg -i xendesktopvda_<version>.debian10_amd64.deb
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Debian dependency list for Debian 10.7:

postgresql              >= 11
libpostgresql-jdbc-java >= 42.2
openjdk-8-jdk           >= 8u252
imagemagick             >= 8:6.9.10
ufw                     >= 0.36
desktop-base            >= 10.0.2
libxrandr2              >= 2:1.5.1
libxtst6                >= 2:1.2.3
libxm4                  >= 2.3.8
util-linux              >= 2.33
gtk3-nocsd              >= 3
bash                    >= 5.0
findutils               >= 4.6.0
sed                     >= 4.7
cups                    >= 2.2
ghostscript             >= 9.27~
libmspack0              >= 0.10
libgoogle-perftools4    >= 2.7~
libpython2.7            >= 2.7~
libsasl2-modules-gssapi-mit >= 2.1.~

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Note:

For a matrix of the Linux distributions and the Xorg versions that this version of the Linux VDA supports, see System requirements.

Step 4c: Upgrade the Linux VDA (optional)

You can upgrade an existing installation from the previous two versions and from an LTSR release.

sudo dpkg -i <PATH>/<Linux VDA deb>
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Step 4d: Configure the Linux VDA

After installing the package, you must configure the Linux VDA by running the ctxsetup.sh script. Before making any changes, the script verifies the environment and ensures that all dependencies are installed. If necessary, you can rerun the script at any time to change settings.

You can run the script manually with prompting, or automatically with preconfigured responses. Review Help about the script before proceeding:

sudo /opt/Citrix/VDA/sbin/ctxsetup.sh --help
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Prompted configuration

Run a manual configuration with prompted questions:

sudo /opt/Citrix/VDA/sbin/ctxsetup.sh
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Automated configuration

For an automated install, the options required by the setup script can be provided with environment variables. If all required variables are present, the script does not prompt the user for any information, allowing for a scripted installation process.

Supported environment variables include:

• CTX_XDL_SUPPORT_DDC_AS_CNAME=Y | N – The Linux VDA supports specifying a Delivery Controller name using a DNS CNAME record. Set to N by default.
• CTX_XDL_DDC_LIST=‘list-ddc-fqdns’ – The Linux VDA requires a space-separated list of Delivery Controller Fully Qualified Domain Names (FQDNs) to use for registering with a Delivery Controller. At least one FQDN or CNAME alias must be specified.
• CTX_XDL_VDA_PORT=port-number – The Linux VDA communicates with Delivery Controllers through a TCP/IP port, which is port 80 by default.
• CTX_XDL_REGISTER_SERVICE=Y | N – The Linux Virtual Desktop services are started after machine startup. Set to Y by default.
• CTX_XDL_ADD_FIREWALL_RULES=Y | N – The Linux Virtual Desktop services require incoming network connections to be allowed through the system firewall. You can open the required ports (ports 80 and 1494 by default) automatically in the system firewall for the Linux Virtual Desktop. Set to Y by default.
• CTX_XDL_AD_INTEGRATION=1 | 2 | 3 | 4 |5 – The Linux VDA requires Kerberos configuration settings to authenticate with the Delivery Controllers. The Kerberos configuration is determined from the installed and configured Active Directory integration tool on the system. Specify the supported Active Directory integration method to use:
  • 1 – Samba Winbind
  • 2 – Quest Authentication Service
  • 3 – Centrify DirectControl
  • 4 – SSSD
  • 5 – PBIS
• CTX_XDL_HDX_3D_PRO=Y | N – The Linux VDA supports HDX 3D Pro, a set of GPU acceleration technologies designed to optimize the virtualization of rich graphics applications. If HDX 3D Pro is selected, the VDA is configured for VDI desktops (single-session) mode - (that is, CTX_XDL_VDI_MODE=Y).
• CTX_XDL_VDI_MODE=Y | N – Whether to configure the machine as a dedicated desktop delivery model (VDI) or hosted shared desktop delivery model. For HDX 3D Pro environments, set this variable to Y. This variable is set to N by default.
• CTX_XDL_SITE_NAME=dns-name – The Linux VDA discovers LDAP servers through DNS. To limit the DNS search results to a local site, specify a DNS site name. This variable is set to <none> by default.
• CTX_XDL_LDAP_LIST=‘list-ldap-servers’ – The Linux VDA queries DNS to discover LDAP servers. If DNS cannot provide LDAP service records, you can provide a space-separated list of LDAP FQDNs with LDAP ports. For example, ad1.mycompany.com:389. This variable is set to <none> by default.
• CTX_XDL_SEARCH_BASE=search-base-set – The Linux VDA queries LDAP through a search base set to the root of the Active Directory Domain (for example, DC=mycompany,DC=com). However, to improve search performance, you can specify a search base (for example, OU=VDI,DC=mycompany,DC=com). This variable is set to <none> by default.
• CTX_XDL_FAS_LIST=‘list-fas-servers’ – The Federated Authentication Service (FAS) servers are configured through AD Group Policy. The Linux VDA does not support AD Group Policy, but you can provide a semicolon-separated list of FAS servers instead. The sequence must be the same as configured in AD Group Policy. If any server address is removed, fill its blank with the <none> text string and do not modify the order of server addresses.
• CTX_XDL_DOTNET_ RUNTIME_PATH=path-to-install-dotnet-runtime – The path to install .NET Core Runtime 3.1 for supporting the new broker agent service (ctxvda). The default path is /usr/bin.
• CTX_XDL_DESKTOP _ENVIRONMENT=gnome/mate – Specifies the GNOME or MATE desktop environment to use in sessions. If you leave the variable unspecified, the desktop currently installed on the VDA is used. However, if the currently installed desktop is MATE, you must set the variable value to mate.

  Note:

  You can also change the desktop environment for a target session user by completing the following steps:

  1. Create a .xsession file under the $HOME/<username> directory on the VDA.

  2. Edit the .xsession file to specify a desktop environment based on distributions.

     For MATE desktop on CentOS, Ubuntu, and Debian

     MSESSION=”$(type -p mate-session)”
     if [ -n “$MSESSION” ]; then
     exec mate-session
     fi

     For GNOME desktop on CentOS

     GSESSION=”$(type -p gnome-session)”
     if [ -n “$GSESSION” ]; then

        export GNOME_SHELL_SESSION_MODE=classic  
        exec gnome-session --session=gnome-classic      fi   **For GNOME desktop on Ubuntu and Debian**
     

     GSESSION=”$(type -p gnome-session)”
     if [ -n “$GSESSION” ]; then

        exec gnome-session      fi  
     

  3. Share the 700 file permission with the target session user.

• CTX_XDL_START_SERVICE=Y | N – Whether or not the Linux VDA services are started when the Linux VDA configuration is complete. Set to Y by default.
• CTX_XDL_TELEMETRY_SOCKET_PORT – The socket port for listening for Citrix Scout. The default port is 7503.
• CTX_XDL_TELEMETRY_PORT – The port for communicating with Citrix Scout. The default port is 7502.

Set the environment variable and run the configure script:

export CTX_XDL_SUPPORT_DDC_AS_CNAME=Y|N

export CTX_XDL_DDC_LIST=‘list-ddc-fqdns’

export CTX_XDL_VDA_PORT=port-number

export CTX_XDL_REGISTER_SERVICE=Y|N

export CTX_XDL_ADD_FIREWALL_RULES=Y|N

export CTX_XDL_AD_INTEGRATION=1|2|3|4|5

export CTX_XDL_HDX_3D_PRO=Y|N

export CTX_XDL_VDI_MODE=Y|N

export CTX_XDL_SITE_NAME=dns-site-name | '<none>'

export CTX_XDL_LDAP_LIST=‘list-ldap-servers’ | '<none>'

export CTX_XDL_SEARCH_BASE=search-base-set | '<none>'

export CTX_XDL_FAS_LIST=‘list-fas-servers’ | '<none>'

export CTX_XDL_DOTNET_RUNTIME_PATH=path-to-install-dotnet-runtime

export CTX_XDL_DESKTOP_ENVIRONMENT= gnome | mate | '<none>'

export CTX_XDL_TELEMETRY_SOCKET_PORT=port-number

export CTX_XDL_TELEMETRY_PORT=port-number

export CTX_XDL_START_SERVICE=Y|N

sudo -E /opt/Citrix/VDA/sbin/ctxsetup.sh
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When running the sudo command, type the -E option to pass the existing environment variables to the new shell it creates. We recommend that you create a shell script file from the preceding commands with #!/bin/bash as the first line.

Alternatively, you can specify all parameters by using a single command:

sudo CTX_XDL_SUPPORT_DDC_AS_CNAME=Y|N \

CTX_XDL_DDC_LIST=‘list-ddc-fqdns’ \

CTX_XDL_VDA_PORT=port-number \

CTX_XDL_REGISTER_SERVICE=Y|N \

CTX_XDL_ADD_FIREWALL_RULES=Y|N \

CTX_XDL_AD_INTEGRATION=1|2|3|4|5 \

CTX_XDL_HDX_3D_PRO=Y|N \

CTX_XDL_VDI_MODE=Y|N \

CTX_XDL_SITE_NAME=dns-name \

CTX_XDL_LDAP_LIST=‘list-ldap-servers’ \

CTX_XDL_SEARCH_BASE=search-base-set \

CTX_XDL_FAS_LIST=‘list-fas-servers’ \

CTX_XDL_DOTNET_RUNTIME_PATH=path-to-install-dotnet-runtime \

CTX_XDL_DESKTOP_ENVIRONMENT=gnome | mate \

CTX_XDL_TELEMETRY_SOCKET_PORT=port-number \

CTX_XDL_TELEMETRY_PORT=port-number \

CTX_XDL_START_SERVICE=Y|N \

/opt/Citrix/VDA/sbin/ctxsetup.sh
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Remove configuration changes

In some scenarios, you might have to remove the configuration changes made by the ctxsetup.sh script without uninstalling the Linux VDA package.

Review Help about this script before proceeding:

sudo /opt/Citrix/VDA/sbin/ctxcleanup.sh --help
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To remove configuration changes:

sudo /opt/Citrix/VDA/sbin/ctxcleanup.sh
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Important:

This script deletes all configuration data from the database and renders the Linux VDA inoperable.

Configuration logs

The ctxsetup.sh and ctxcleanup.sh scripts display errors on the console, with additional information written to the configuration log file /tmp/xdl.configure.log.

Restart the Linux VDA services to have the changes take effect.

Uninstall the Linux VDA software

To check whether the Linux VDA is installed and to view the version of the installed package:

dpkg -l xendesktopvda
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To view more detailed information:

apt-cache show xendesktopvda
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To uninstall the Linux VDA software:

dpkg -r xendesktopvda
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Note:

Uninstalling the Linux VDA software deletes the associated PostgreSQL and other configuration data. However, the PostgreSQL package and other dependent packages that were set up before the installation of the Linux VDA are not deleted.

Tip:

The information in this section does not cover the removal of dependent packages including PostgreSQL.

Step 5: Run the Linux VDA

Once you have configured the Linux VDA using the ctxsetup.sh script, you use the following commands to control the Linux VDA.

Start the Linux VDA:

To start the Linux VDA services:

sudo systemctl start ctxhdx

sudo systemctl start ctxvda
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Stop the Linux VDA:

To stop the Linux VDA services:

sudo systemctl stop ctxvda

sudo systemctl stop ctxhdx
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Note:

Before you stop the ctxvda and ctxhdx services, run the service ctxmonitorservice stop command to stop the monitor service daemon. Otherwise, the monitor service daemon restarts the services you stopped.

Restart the Linux VDA:

To restart the Linux VDA services:

sudo systemctl stop ctxvda

sudo systemctl restart ctxhdx

sudo systemctl restart ctxvda
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Check the Linux VDA status:

To check the running status of the Linux VDA services:

sudo systemctl status ctxvda

sudo systemctl status ctxhdx
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Step 6: Create the machine catalog in Citrix Virtual Apps or Citrix Virtual Desktops

The process for creating machine catalogs and adding Linux VDA machines is similar to the traditional Windows VDA approach. For a more detailed description of how to complete these tasks, see Create machine catalogs and Manage machine catalogs.

For creating machine catalogs that contain Linux VDA machines, there are a few restrictions that differentiate the process from creating machine catalogs for Windows VDA machines:

• For the operating system, select:
  • The Multi-session OS option for a hosted shared desktops delivery model.
  • The Single-session OS option for a VDI dedicated desktop delivery model.
• Do not mix Linux and Windows VDA machines in the same machine catalog.

Note:

Early versions of Citrix Studio did not support the notion of a “Linux OS.” However, selecting the Windows Server OS or Server OS option implies an equivalent hosted shared desktops delivery model. Selecting the Windows Desktop OS or Desktop OS option implies a single user per machine delivery model.

Tip:

If you remove and rejoin a machine to the Active Directory domain, you must remove and add the machine to the machine catalog again.

Step 7: Create the delivery group in Citrix Virtual Apps or Citrix Virtual Desktops

The process for creating a delivery group and adding machine catalogs containing Linux VDA machines is almost identical to Windows VDA machines. For a more detailed description of how to complete these tasks, see Create Delivery Groups.

For creating delivery groups that contain Linux VDA machine catalogs, the following restrictions apply:

• Ensure that the AD users and groups you select have been properly configured to log on to the Linux VDA machines.
• Do not allow logon of unauthenticated (anonymous) users.
• Do not mix the delivery group with machine catalogs that contain Windows machines.

For information about how to create machine catalogs and delivery groups, see Citrix Virtual Apps and Desktops 7 2103.