[ClusterLabs] Current DC becomes None suddenly
Pritam Kharat
pritam.kharat at oneconvergence.com
Thu Oct 8 14:56:33 UTC 2015
Hi Ken,
Please see inline comments of last mail
On Thu, Oct 8, 2015 at 8:25 PM, Pritam Kharat <
pritam.kharat at oneconvergence.com> wrote:
> Hi Ken,
>
> Thanks for reply.
>
> On Thu, Oct 8, 2015 at 8:13 PM, Ken Gaillot <kgaillot at redhat.com> wrote:
>
>> On 10/02/2015 01:47 PM, Pritam Kharat wrote:
>> > Hi,
>> >
>> > I have set up a ACTIVE/PASSIVE HA
>> >
>> > *Issue 1) *
>> >
>> > *corosync.conf* file is
>> >
>> > # Please read the openais.conf.5 manual page
>> >
>> > totem {
>> >
>> > version: 2
>> >
>> > # How long before declaring a token lost (ms)
>> > token: 10000
>> >
>> > # How many token retransmits before forming a new configuration
>> > token_retransmits_before_loss_const: 20
>> >
>> > # How long to wait for join messages in the membership protocol
>> (ms)
>> > join: 10000
>> >
>> > # How long to wait for consensus to be achieved before starting
>> a
>> > new round of membership configuration (ms)
>> > consensus: 12000
>> >
>> > # Turn off the virtual synchrony filter
>> > vsftype: none
>> >
>> > # Number of messages that may be sent by one processor on
>> receipt
>> > of the token
>> > max_messages: 20
>> >
>> > # Limit generated nodeids to 31-bits (positive signed integers)
>> > clear_node_high_bit: yes
>> >
>> > # Disable encryption
>> > secauth: off
>> >
>> > # How many threads to use for encryption/decryption
>> > threads: 0
>> >
>> > # Optionally assign a fixed node id (integer)
>> > # nodeid: 1234
>> >
>> > # This specifies the mode of redundant ring, which may be none,
>> > active, or passive.
>> > rrp_mode: none
>> > interface {
>> > # The following values need to be set based on your
>> > environment
>> > ringnumber: 0
>> > bindnetaddr: 192.168.101.0
>> > mcastport: 5405
>> > }
>> >
>> > transport: udpu
>> > }
>> >
>> > amf {
>> > mode: disabled
>> > }
>> >
>> > quorum {
>> > # Quorum for the Pacemaker Cluster Resource Manager
>> > provider: corosync_votequorum
>> > expected_votes: 1
>>
>> If you're using a recent version of corosync, use "two_node: 1" instead
>> of "expected_votes: 1", and get rid of "no-quorum-policy: ignore" in the
>> pacemaker cluster options.
>>
>> -> We are using corosync version 2.3.3. Do we above mentioned change
> for this version ?
>
>
>
>> > }
>> >
>> >
>> > nodelist {
>> >
>> > node {
>> > ring0_addr: 192.168.101.73
>> > }
>> >
>> > node {
>> > ring0_addr: 192.168.101.74
>> > }
>> > }
>> >
>> > aisexec {
>> > user: root
>> > group: root
>> > }
>> >
>> >
>> > logging {
>> > fileline: off
>> > to_stderr: yes
>> > to_logfile: yes
>> > to_syslog: yes
>> > syslog_facility: daemon
>> > logfile: /var/log/corosync/corosync.log
>> > debug: off
>> > timestamp: on
>> > logger_subsys {
>> > subsys: AMF
>> > debug: off
>> > tags: enter|leave|trace1|trace2|trace3|trace4|trace6
>> > }
>> > }
>> >
>> > And I have added 5 resources - 1 is VIP and 4 are upstart jobs
>> > Node names are configured as -> sc-node-1(ACTIVE) and sc-node-2(PASSIVE)
>> > Resources are running on ACTIVE node
>> >
>> > Default cluster properties -
>> >
>> > <cluster_property_set id="cib-bootstrap-options">
>> > <nvpair id="cib-bootstrap-options-dc-version" name="dc-version"
>> > value="1.1.10-42f2063"/>
>> > <nvpair id="cib-bootstrap-options-cluster-infrastructure"
>> > name="cluster-infrastructure" value="corosync"/>
>> > <nvpair name="no-quorum-policy" value="ignore"
>> > id="cib-bootstrap-options-no-quorum-policy"/>
>> > <nvpair name="stonith-enabled" value="false"
>> > id="cib-bootstrap-options-stonith-enabled"/>
>> > <nvpair name="cluster-recheck-interval" value="3min"
>> > id="cib-bootstrap-options-cluster-recheck-interval"/>
>> > <nvpair name="default-action-timeout" value="120s"
>> > id="cib-bootstrap-options-default-action-timeout"/>
>> > </cluster_property_set>
>> >
>> >
>> > But sometimes after 2-3 migrations from ACTIVE to STANDBY and then from
>> > STANDBY to ACTIVE,
>> > both nodes become OFFLINE and Current DC becomes None, I have disabled
>> the
>> > stonith property and even quorum is ignored
>>
>> Disabling stonith isn't helping you. The cluster needs stonith to
>> recover from difficult situations, so it's easier to get into weird
>> states like this without it.
>>
>> > root at sc-node-2:/usr/lib/python2.7/dist-packages/sc# crm status
>> > Last updated: Sat Oct 3 00:01:40 2015
>> > Last change: Fri Oct 2 23:38:28 2015 via crm_resource on sc-node-1
>> > Stack: corosync
>> > Current DC: NONE
>> > 2 Nodes configured
>> > 5 Resources configured
>> >
>> > OFFLINE: [ sc-node-1 sc-node-2 ]
>> >
>> > What is going wrong here ? What is the reason for node Current DC
>> becoming
>> > None suddenly ? Is corosync.conf okay ? Are default cluster properties
>> fine
>> > ? Help will be appreciated.
>>
>> I'd recommend seeing how the problem behaves with stonith enabled, but
>> in any case you'll need to dive into the logs to figure what starts the
>> chain of events.
>>
>>
> -> We are seeing this issue when we try rebooting the vms
>
> >
>> > *Issue 2)*
>> > Command used to add upstart job is
>> >
>> > crm configure primitive service upstart:service meta allow-migrate=true
>> > migration-threshold=5 failure-timeout=30s op monitor interval=15s
>> > timeout=60s
>> >
>> > But still sometimes I see fail count going to INFINITY. Why ? How can we
>> > avoid it ? Resource should have migrated as soon as it reaches migration
>> > threshold.
>> >
>> > * Node sc-node-2:
>> > service: migration-threshold=5 fail-count=1000000 last-failure='Fri
>> Oct
>> > 2 23:38:53 2015'
>> > service1: migration-threshold=5 fail-count=1000000 last-failure='Fri
>> Oct
>> > 2 23:38:53 2015'
>> >
>> > Failed actions:
>> > service_start_0 (node=sc-node-2, call=-1, rc=1, status=Timed Out,
>> > last-rc-change=Fri Oct 2 23:38:53 2015
>> > , queued=0ms, exec=0ms
>> > ): unknown error
>> > service1_start_0 (node=sc-node-2, call=-1, rc=1, status=Timed Out,
>> > last-rc-change=Fri Oct 2 23:38:53 2015
>> > , queued=0ms, exec=0ms
>>
>> migration-threshold is used for monitor failures, not (by default) start
>> or stop failures.
>>
>> This is a start failure, which (by default) makes the fail-count go to
>> infinity. The rationale is that a monitor failure indicates some sort of
>> temporary error, but failing to start could well mean that something is
>> wrong with the installation or configuration.
>>
>> You can tell the cluster to apply migration-threshold to start failures
>> too, by setting the start-failure-is-fatal=false cluster option.
>>
>>
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>>
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>>
>
>
>
> --
> Thanks and Regards,
> Pritam Kharat.
>
--
Thanks and Regards,
Pritam Kharat.
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