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71 lines
2.4 KiB
Plaintext
71 lines
2.4 KiB
Plaintext
// Module included in the following assemblies:
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//
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// * etcd/etcd-performance.adoc
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:_mod-docs-content-type: PROCEDURE
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[id="etcd-consensus-latency_{context}"]
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= Monitoring consensus latency for etcd
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By using the `etcdctl` CLI, you can monitor the latency for reaching consensus as experienced by etcd. You must identify one of the etcd pods and then retrieve the endpoint health.
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This procedure, which validates and monitors cluster health, can be run only on an active cluster.
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.Prerequisites
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* During planning for cluster deployment, you completed the disk and network tests.
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.Procedure
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. Enter the following command:
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+
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[source,terminal]
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----
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# oc get pods -n openshift-etcd -l app=etcd
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----
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+
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.Example output
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[source,terminal]
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----
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NAME READY STATUS RESTARTS AGE
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etcd-m0 4/4 Running 4 8h
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etcd-m1 4/4 Running 4 8h
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etcd-m2 4/4 Running 4 8h
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----
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. Enter the following command. To better understand the etcd latency for consensus, you can run this command on a precise watch cycle for a few minutes to observe that the numbers remain below the ~66 ms threshold. The closer the consensus time is to 100 ms, the more likely the cluster will experience service-affecting events and instability.
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+
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[source,terminal]
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----
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# oc exec -ti etcd-m0 -- etcdctl endpoint health -w table
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----
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.Example output
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[source,terminal]
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----
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+----------------------------+--------+-------------+-------+
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| ENDPOINT | HEALTH | TOOK | ERROR |
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+----------------------------+--------+-------------+-------+
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| https://198.18.111.12:2379 | true | 3.798349ms | |
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| https://198.18.111.14:2379 | true | 7.389608ms | |
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| https://198.18.111.13:2379 | true | 6.263117ms | |
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+----------------------------+--------+-------------+-------+
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----
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. Enter the following command:
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[source,terminal]
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----
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# oc exec -ti etcd-m0 -- watch -dp -c etcdctl endpoint health -w table
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----
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.Example output
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[source,terminal]
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----
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+----------------------------+--------+-------------+-------+
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| ENDPOINT | HEALTH | TOOK | ERROR |
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+----------------------------+--------+-------------+-------+
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| https://198.18.111.12:2379 | true | 9.533405ms | |
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| https://198.18.111.13:2379 | true | 4.628054ms | |
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| https://198.18.111.14:2379 | true | 5.803378ms | |
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+----------------------------+--------+-------------+-------+
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---- |