How to Find ETCD Leader and Check ETCD Health

Problem

How to find ETCD Leader and check ETCD Health in a Platform9 Managed Kubernetes Cluster?

Environment

Platform9 Managed Kubernetes - All Versions
ETCD
Docker and Containerd

Procedure

SSH into any one of the Master nodes and become a root user.
For docker based container runtime: Run the following command to copy the etcdctl binary from the etcd container running on the node and update the PATH variable.

Docker
    
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docker cp etcd:/usr/local/bin/etcdctl /opt/pf9/pf9-kube/bin  export PATH=$PATH:/opt/pf9/pf9-kube/bin
Copy

Run the etcdctl command to find out the ETCD Leader and look for IS LEADER column

Docker
Containerd
    
 
# /opt/pf9/pf9-kube/bin/etcdctl  endpoint status -w=table+----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+|    ENDPOINT    |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |+----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+| 127.0.0.1:2379 | 5ad09a7031a6a983 |  3.4.14 |   13 MB |     false |      false |        83 |    6676368 |            6676368 |        |+----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
Copy

Run the etcdctl command to check ETCD Health of Member/Endpoints.

Docker
Containerd
    
 
# /opt/pf9/pf9-kube/bin/etcdctl endpoint health --cluster  -w=table --endpoints=http://127.0.0.1:2379 --cacert="/etc/pf9/kube.d/certs/etcdctl/etcd/ca.crt" --cert="/etc/pf9/kube.d/certs/etcdctl/etcd/request.crt" --key="/etc/pf9/kube.d/certs/etcdctl/etcd/request.key"+-----------------------------+--------+-------------+-------+|          ENDPOINT           | HEALTH |    TOOK     | ERROR |+-----------------------------+--------+-------------+-------+| https://10.128.146.244:4001 |   true | 18.427771ms |       || https://10.128.147.235:4001 |   true | 18.958459ms |       ||  https://10.128.146.71:4001 |   true | 20.086052ms |       |+-----------------------------+--------+-------------+-------+
Copy

Additional Information

Kubernetes Docs - Configure/Upgrade ETCD

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