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Chapter 8. Modifying, displaying, and exporting the corosync.conf file

The corosync.conf file provides the cluster parameters used by corosync, the cluster manager that Pacemaker is built on. In general, you should not edit the corosync.conf directly but, instead, use the pcs interface

8.1. Modifying the corosync.conf file with the pcs command
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You can use the pcs command to modify the parameters in the corosync.conf file.

The following command modifies the parameters in the corosync.conf file: 

pcs cluster config update [transport pass:quotes[transport options]] [compression pass:quotes[compression options]] [crypto pass:quotes[crypto options]] [totem pass:quotes[totem options]] [--corosync_conf pass:quotes[path]]
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The following example command udates the knet_pmtud_interval transport value and the token and join totem values: 

# pcs cluster config update transport knet_pmtud_interval=35 totem token=10000 join=100
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8.2. Displaying the corosync.conf file with the pcs command
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The following command displays the contents of the corosync.conf cluster configuration file. 

# pcs cluster corosync
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You can print the contents of the corosync.conf file in a human-readable format with the pcs cluster config command, as in the following example.

The output for this command includes the UUID for the cluster if the UUID was added manually as described in Identifying clusters by UUID. 

[root@r8-node-01 ~]# pcs cluster config
Cluster Name: HACluster
Cluster UUID: ad4ae07dcafe4066b01f1cc9391f54f5
Transport: knet
Nodes:
  r8-node-01:
    Link 0 address: r8-node-01
    Link 1 address: 192.168.122.121
    nodeid: 1
  r8-node-02:
    Link 0 address: r8-node-02
    Link 1 address: 192.168.122.122
    nodeid: 2
Links:
  Link 1:
    linknumber: 1
    ping_interval: 1000
    ping_timeout: 2000
    pong_count: 5
Compression Options:
  level: 9
  model: zlib
  threshold: 150
Crypto Options:
  cipher: aes256
  hash: sha256
Totem Options:
  downcheck: 2000
  join: 50
  token: 10000
Quorum Device: net
  Options:
    sync_timeout: 2000
    timeout: 3000
  Model Options:
    algorithm: lms
    host: r8-node-03
  Heuristics:
    exec_ping: ping -c 1 127.0.0.1
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8.3. Exporting the corosync.conf file
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You can run the pcs cluster config show command with the --output-format=cmd option to display the pcs configuration commands that can be used to recreate the existing corosync.conf file on a different system, as in the following example. 

[root@r8-node-01 ~]# pcs cluster config show --output-format=cmd
pcs cluster setup HACluster \
  r8-node-01 addr=r8-node-01 addr=192.168.122.121 \
  r8-node-02 addr=r8-node-02 addr=192.168.122.122 \
  transport \
  knet \
    link \
      linknumber=1 \
      ping_interval=1000 \
      ping_timeout=2000 \
      pong_count=5 \
    compression \
      level=9 \
      model=zlib \
      threshold=150 \
    crypto \
      cipher=aes256 \
      hash=sha256 \
  totem \
    downcheck=2000 \
    join=50 \
    token=10000
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