Update etcd

categories/apps/etcd.md

@@ -2,8 +2,11 @@
 
 etcd is a strongly consistent, distributed key-value store that provides a reliable way to store data that needs to be accessed by a distributed system or cluster of machines. It gracefully handles leader elections during network partitions and can tolerate machine failure, even in the leader node.
 
-##  Tips
+## Set up a ETCD cluster
 
+https://github.com/kelseyhightower/kubernetes-the-hard-way/blob/master/docs/07-bootstrapping-etcd.md
+
+##  Tips
 
 ### Make the k8s embedded single etcd to be a cluster
 
@@ -21,3 +24,13 @@ sudo ETCDCTL_API=3 etcdctl make-mirror https://new_etcd_node:2379 --endpoints=ht
 ```
 sudo ETCDCTL_API=3 etcdctl get --prefix=true "" -w json  --endpoints=https://127.0.0.1:2379   --cacert=/new_etcd/ca.pem   --cert=/new_etcd/etcd.pem   --key=/new_etcd/etcd-key.pem
 ```
+
+### Join another existing cluster
+
+1. Run the join command on an existing node, for instnace
+```
+sudo ETCDCTL_API=3 etcdctl member add server-2 --peer-urls=https://192.168.1.xxx:2380  --endpoints=https://192.168.1.xxx:2379,https://192.168.1.xxx:2379   --cacert=/etc/etcd/ca.pem   --cert=/etc/etcd/etcd.pem   --key=/etc/etcd/etcd-key.pem
+```
+2. Prepare for the configursations for the new node, and remember to set `--initial-cluster-state` to existing
+3. Start the etcd service of the new node
+