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diff --git a/zookeeper/README.md b/zookeeper/README.md deleted file mode 100644 index f485148..0000000 --- a/zookeeper/README.md +++ /dev/null @@ -1,85 +0,0 @@ -# Zookeeper - -This example runs zookeeper through a petset. - -## Bootstrap - -Create the petset in this directory -``` -$ kubetl create -f zookeeper.yaml -``` - -Once you have all 3 nodes in Running, you can run the "test.sh" script in this directory. - -## Failover - -You can test failover by killing the leader. Insert a key: -```console -$ kubectl -n kafka exec zoo-0 -- /opt/zookeeper/bin/zkCli.sh create /foo bar; -$ kubectl -n kafka exec zoo-2 -- /opt/zookeeper/bin/zkCli.sh get /foo; - -Watch existing members: -```console -$ kubectl -n kafka run --attach bbox --image=busybox --restart=Never -- sh -c 'while true; do for i in 0 1 2; do echo zoo-$i $(echo stats | nc zoo-$i.zk:2181 | grep Mode); sleep 1; done; done'; -zoo-2 Mode: follower -zoo-0 Mode: follower -zoo-1 Mode: leader -zoo-2 Mode: follower -``` - -Delete pets and wait for the petset controller to bring the back up: -```console -$ kubectl -n kafka delete po -l app=zk -$ kubectl -n kafka get po --watch-only -NAME READY STATUS RESTARTS AGE -zoo-0 0/1 Init:0/2 0 16s -zoo-0 0/1 Init:0/2 0 21s -zoo-0 0/1 PodInitializing 0 23s -zoo-0 1/1 Running 0 41s -zoo-1 0/1 Pending 0 0s -zoo-1 0/1 Init:0/2 0 0s -zoo-1 0/1 Init:0/2 0 14s -zoo-1 0/1 PodInitializing 0 17s -zoo-1 0/1 Running 0 18s -zoo-2 0/1 Pending 0 0s -zoo-2 0/1 Init:0/2 0 0s -zoo-2 0/1 Init:0/2 0 12s -zoo-2 0/1 Init:0/2 0 28s -zoo-2 0/1 PodInitializing 0 31s -zoo-2 0/1 Running 0 32s -... - -zoo-0 Mode: follower -zoo-1 Mode: leader -zoo-2 Mode: follower -``` - -Check the previously inserted key: -```console -$ kubectl -n kafka exec zoo-1 -- /opt/zookeeper/bin/zkCli.sh get /foo -ionid = 0x354887858e80035, negotiated timeout = 30000 - -WATCHER:: - -WatchedEvent state:SyncConnected type:None path:null -bar -``` - -## Scaling - -You can scale up by modifying the number of replicas on the PetSet. - -## Image Upgrade - -TODO: Add details - -## Maintenance - -TODO: Add details - -## Limitations -* Both petset and init containers are in alpha -* Look through the on-start and on-change scripts for TODOs -* Doesn't support the addition of observers through the petset -* Only supports storage options that have backends for persistent volume claims - |