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Chapter 6. High Availability (HA)
Warning
It is VERY IMPORTANT that 127.0.0.1 is not in the list of terminal
servers. If the machines running VSM server are also VSM agents, their
unique hostnames or IP addresses must be added to the
/vsmserver/terminalservers instead of 127.0.0.1. The reason for this
is that 127.0.0.1 will be a different server based on which VSM server is
currently active.
7. After verifying that normal ThinLinc connections work as intended when using both the primary
and the secondary VSM server’s hostname, it is time to enable HA in the VSM servers. This is done
by setting /vsmserver/HA/enabled to 1, and by specifying the nodes in the cluster in
/vsmserver/HA/nodes. For example:
[root@tlha-primary root] tl-config /vsmserver/HA/enabled=1
[root@tlha-primary root] tl-config ’/vsmserver/HA/nodes=tlha-primary.example.com tlha-secondary.example.com’
Configuration should be identical on both nodes. Restart the VSM server on both nodes after
configuration.
8. If vsmserver can’t safely determine which of the two nodes in /vsmserver/HA/nodes is the
remote node, and which is the local node, it will start without HA enabled, and log a message. If this
happens, validate your hostname and DNS setup. One of the entries of /vsmserver/HA/nodes
must match the local machine. Either the resolved IP of one of the entries in
/vsmserver/HA/nodes must match the local IP, or one entry must exactly match the local
hostname as returned by uname -n.
9. Once HA has been configured, tests should be performed in order to confirm that the failover works
as expected. This can normally be done by simply removing the network cable from the primary
node, and ensuring that the secondary node then takes over. Check also that any active ThinLinc
sessions have been synchronized from the primary to the secondary node, and that logging in to such
a session on the secondary node succeeds once the primary node has been disabled.
Your ThinLinc HA cluster is now configured! When sessions are created, changed or deleted on the
currently active node, the information about them will be transferred to the other node using a inter-VSM
server protocol. If the other node has to take over service, its copy of the session data will be up to date,
and it can start serving new requests instantly. When the primary node comes up again, the secondary
node will resynchronise with the master.
6.2.2. Reconfiguring an existing ThinLinc Installation into HA mode
If you have an existing ThinLinc installation and want to eliminate the single point of failure (the VSM
server), the procedure is very much like the procedure for installing a new HA cluster.
6.3. Recovering from hardware failures
If situations occur where the secondary node has been forced to take over service because the primary
node failed for some reason, it’s important to know how to recover.
34
- Copyright © 2014 Cendio AB 2
- Table of Contents 3
- Chapter 1. Introduction 11
- 2.1. Session Overview 14
- Chapter 3. Installation 15
- 3.2.3. Server Sizing 16
- • Memory 17
- 3.3.4.1. Relays 21
- 3.3.4.2. DNS 22
- 3.5.1. Acquire New Licenses 23
- 3.5.4. Run tl-setup 24
- 3.7.1. Overview 25
- 3.8. VirtualGL 26
- Chapter 4. License Handling 29
- Chapter 5. Printer Features 31
- 5.2.1. CUPS Browsing 32
- 5.3. Local printer support 33
- 5.3.3. Device dependent mode 34
- 5.4. Nearest printer support 35
- 5.5. Printer Access Control 36
- 5.5.1. Theory of Operation 37
- 5.5.2. Requirements 37
- 5.5.4. Configuration 38
- 5.6.1. Configuration 39
- 6.1. Overview 41
- 6.1.3. Theory of Operation 42
- /etc/ssh/ssh_host_ 43
- /vsmserver/terminalservers 43
- 7.1. Client usage 47
- 7.1.3. Language Settings 49
- 7.1.5. The session menu 50
- 7.3. Local device export 53
- 7.3.3. Drives 54
- 7.3.4. Printer 54
- 7.3.5. Smart Card Readers 54
- 7.4. Client configuration 55
- 7.4.2. Local Devices tab 57
- /dev/ttyS0) or a Windows COM 59
- 7.4.3. Screen tab 61
- 7.4.4. Optimization tab 62
- 7.4.5. Security tab 65
- ALLOW_HOSTKEY_UPDATE 66
- Smart card - certificate filter 68
- 7.5. The XDM mode (UNIX only) 69
- 7.5.1.1. Mouse tab 70
- 7.5.1.2. Keyboard tab 70
- 7.5.1.3. Screen tab 71
- 7.6. Logfile placement 72
- • 1 for port 80 78
- • 0 for Raw 79
- • 5 for Hextile 79
- • 7 for Tight 79
- • 16 for ZRLE 79
- 7.8. Client Customizer 81
- 7.9. Advanced Topics 82
- 8.3. Linux PC 84
- ~/tl-4.3.0-clients 85
- 8.4. Solaris 87
- 8.5. Thin Terminals 87
- 8.5.3. VXL 89
- 8.5.4. HP ThinPro Terminals 89
- 8.5.5. IGEL Universal Desktop 90
- 8.5.8. Other Thin Terminals 91
- Terminal 92
- 8.6.2.1. Basic Configuration 93
- ServerAlias 94
- 8.7.3.1. Server Side 97
- 8.7.3.2. Browser Side 98
- Chapter 8. Client Platforms 100
- 9.2. Limitations 101
- • Trigger a run via iManager 104
- [root@test root] 105
- <filename.pem> 105
- 9.3.5.1. Functionality 109
- 9.3.5.2. Configuration 110
- 9.4.1. Introduction 111
- Single Sign-On 111
- 9.4.2. Key Generation 112
- 9.4.3. Server Configuration 112
- 9.4.4. Client Configuration 112
- 9.5.1. Introduction 113
- 9.5.2. General Requirements 113
- 9.5.3. Key Generation 113
- 9.5.4. Server Configuration 113
- 9.5.5. Client Configuration 114
- 9.5.6. Automatic Connection 114
- 9.5.7.1. Command line options 115
- 9.5.7.2. Configuration 116
- Configuration parameters 116
- 9.6. Using One Time Passwords 118
- Chapter 10. File Access 121
- 10.1.3.1. Using tl-mount-cifs 122
- 10.2.1. Introduction 123
- 10.2.2.1. Requirements 124
- 10.2.3.1. Requirements 126
- 10.2.3.2. Logging in 126
- 10.2.3.3. Mounting Shares 127
- 10.2.3.4. Logging out 127
- 10.2.4.1. Requirements 128
- 10.2.4.2. NDS Configuration 128
- 10.2.4.4. UNIX Configuration 129
- 10.3.1. Introduction 132
- 10.3.2. Activation 132
- 10.3.3. Configuration 133
- 11.1. Introduction 135
- 11.2. Single Sign-On 135
- 11.3. Connection Modes 135
- 12.1.1. Introduction 139
- 12.2.1. Introduction 141
- 12.2.2. Requirements 141
- 12.3.1. Introduction 142
- 12.3.2. Requirements 142
- 12.3.3.3. OSS applications 143
- 12.3.3.4. ALSA applications 144
- 12.4.1. Introduction 145
- 12.4.2. Requirements 145
- Commands in /opt/thinlinc/bin 147
- ~/.ICAClient/appsrv.ini and 152
- ~/.ICAClient/reg.ini 152
- --test ] 155
- 14.1.1. Configuration Options 157
- 14.1.2. Cluster Management 157
- 14.2.3. Parameters in /vsm/ 163
- 14.3.1.1. Log destinations 166
- 14.3.1.2. Subloggers 167
- 14.3.1.3. Log levels 167
- 14.3.2. Per-Session Logging 168
- • -MaxDisconnectionTime s 176
- • -MaxConnectionTime s 176
- • -MaxIdleTime s 176
- Chapter 15. Hiveconf 179
- 15.1.3. Mounting Datasources 180
- 15.2. Hiveconf and ThinLinc 181
- Administration Interface 183
- 16.3. Modules 184
- 16.3.3. The VSM Module 185
- 16.3.3.1. Home 186
- 16.3.3.2. VSM Master 186
- 16.3.3.3. VSM Agent 186
- 16.3.4. The Profiles Module 187
- 16.3.5. The Locations Module 189
- 16.3.5.2. Locations 191
- 16.3.6.1. Application Groups 193
- 16.3.6.4. Menu Structure 193
- Desktop Customizer 197
- 17.2.1. Concepts 198
- 17.2.3. Handling Applications 199
- • Command 200
- • Path to Icon file 201
- • Command Startup Feedback 201
- /opt/kde3 205
- See Section 16.2 for details 207
- /vsm/tunnelservices 208
- SSH tunnel, SSH terminated.) 212
- C.1. Schema extensions 215
- /etc/ldap.conf 216
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