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Bug 1535967 - pcs should allow to set the netmtu when configuring the cluster
Summary: pcs should allow to set the netmtu when configuring the cluster
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: pcs
Version: 7.4
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Ondrej Mular
QA Contact: cluster-qe@redhat.com
URL:
Whiteboard:
Depends On:
Blocks: 1520573
TreeView+ depends on / blocked
 
Reported: 2018-01-18 11:03 UTC by Michele Baldessari
Modified: 2018-10-30 08:06 UTC (History)
7 users (show)

Fixed In Version: pcs-0.9.165-1.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-10-30 08:05:31 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2018:3066 0 None None None 2018-10-30 08:06:10 UTC

Description Michele Baldessari 2018-01-18 11:03:37 UTC 
Right now it is not possible to set the MTU used by corosync when creating the cluster. Since corosync defaults to 1500, this might be problematic in certain setups (thing CI running a pacemaker-based control plane in VMs where the MTU is a bit lower).

It's be great if we had a --netmtu parameter when calling 'pcs cluster setup', so we could programmatically set the mtu to the right value when creating the cluster.
Comment 3 Ondrej Mular 2018-05-16 12:22:57 UTC 
Proposed fix:
https://github.com/ClusterLabs/pcs/commit/6028859eb969645402d5486123c9c4815846

Test:
[root@rhel75-node1 ~]# pcs cluster setup --name cluster1 rhel75-node1 --netmtu 25000 --local
Shutting down pacemaker/corosync services...
Killing any remaining services...
Removing all cluster configuration files...
[root@rhel75-node1 ~]# pcs cluster corosync 
totem {
    version: 2
    cluster_name: cluster1
    secauth: off
    transport: udpu
    netmtu: 25000
}

nodelist {
    node {
        ring0_addr: rhel75-node1
        nodeid: 1
    }
}

quorum {
    provider: corosync_votequorum
}

logging {
    to_logfile: yes
    logfile: /var/log/cluster/corosync.log
    to_syslog: yes
}
Comment 4 Ivan Devat 2018-06-22 12:12:48 UTC 
After Fix:

[ant ~] $ rpm -q pcs pcs-snmp
pcs-0.9.165-1.el7.x86_64
pcs-snmp-0.9.165-1.el7.x86_64

[ant ~] $ pcs cluster setup --name=zoo ant bee --netmtu 25000
Destroying cluster on nodes: ant, bee...
ant: Stopping Cluster (pacemaker)...
bee: Stopping Cluster (pacemaker)...
bee: Successfully destroyed cluster
ant: Successfully destroyed cluster

Sending 'pacemaker_remote authkey' to 'ant', 'bee'
ant: successful distribution of the file 'pacemaker_remote authkey'
bee: successful distribution of the file 'pacemaker_remote authkey'
Sending cluster config files to the nodes...
ant: Succeeded
bee: Succeeded

Synchronizing pcsd certificates on nodes ant, bee...
ant: Success
bee: Success
Restarting pcsd on the nodes in order to reload the certificates...
ant: Success
bee: Success
[ant ~] $ pcs cluster corosync|grep -B5 netmtu
totem {
    version: 2
    cluster_name: zoo
    secauth: off
    transport: udpu
    netmtu: 25000
Comment 8 errata-xmlrpc 2018-10-30 08:05:31 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3066
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