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#kubectl exec -ti zookeeper-containerID bash
root@zk-0:/opt/zookeeper-3.4.13# bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.13/bin/../conf/zoo.cfg
Mode: standalone

2018-06-29 02:46:47,330 [myid:] - INFO [main:Environment@100] - Client environment:java.home=/usr/lib/jvm/java-1.8-openjdk/jre
2018-06-29 02:46:47,331 [myid:] - INFO [main:Environment@100] - Client environment:java.class.path=/zookeeper-3.4.12/bin/../build/classes:/zookeeper-3.4.12/bin/../build/lib/.jar:/zookeeper-3.4.12/bin/../lib/slf4j-log4j12-1.7.25.jar:/zookeeper-3.4.12/bin/../lib/slf4j-api-1.7.25.jar:/zookeeper-3.4.12/bin/../lib/netty-3.10.6.Final.jar:/zookeeper-3.4.12/bin/../lib/log4j-1.2.17.jar:/zookeeper-3.4.12/bin/../lib/jline-0.9.94.jar:/zookeeper-3.4.12/bin/../lib/audience-annotations-0.5.0.jar:/zookeeper-3.4.12/bin/../zookeeper-3.4.12.jar:/zookeeper-3.4.12/bin/../src/java/lib/.jar:/conf:
2018-06-29 02:46:47,331 [myid:] - INFO [main:Environment@100] - Client environment:java.library.path=/usr/lib/jvm/java-1.8-openjdk/jre/lib/amd64/server:/usr/lib/jvm/java-1.8-openjdk/jre/lib/amd64:/usr/lib/jvm/java-1.8-openjdk/jre/../lib/amd64:/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2018-06-29 02:46:47,331 [myid:] - INFO [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2018-06-29 02:46:47,331 [myid:] - INFO [main:Environment@100] - Client environment:java.compiler=
2018-06-29 02:46:47,331 [myid:] - INFO [main:Environment@100] - Client environment:os.name=Linux
2018-06-29 02:46:47,331 [myid:] - INFO [main:Environment@100] - Client environment:os.arch=amd64
2018-06-29 02:46:47,331 [myid:] - INFO [main:Environment@100] - Client environment:os.version=3.10.0-693.21.1.el7.x86_64
2018-06-29 02:46:47,331 [myid:] - INFO [main:Environment@100] - Client environment:user.name=root
2018-06-29 02:46:47,331 [myid:] - INFO [main:Environment@100] - Client environment:user.home=/root
2018-06-29 02:46:47,332 [myid:] - INFO [main:Environment@100] - Client environment:user.dir=/zookeeper-3.4.12
2018-06-29 02:46:47,334 [myid:] - INFO [main:ZooKeeper@441] - Initiating client connection, connectString=zk2:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@446cdf90
2018-06-29 02:46:47,343 [myid:] - ERROR [main:StaticHostProvider@83] - Unable to connect to server: zk2:2181
java.net.UnknownHostException: zk2: Name does not resolve
at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
at java.net.InetAddress.getAllByName0(InetAddress.java:1276)
at java.net.InetAddress.getAllByName(InetAddress.java:1192)
at java.net.InetAddress.getAllByName(InetAddress.java:1126)
at org.apache.zookeeper.client.StaticHostProvider.(StaticHostProvider.java:62)
at org.apache.zookeeper.ZooKeeper.(ZooKeeper.java:449)
at org.apache.zookeeper.ZooKeeperMain.connectToZK(ZooKeeperMain.java:283)
at org.apache.zookeeper.ZooKeeperMain.(ZooKeeperMain.java:297)
at org.apache.zookeeper.ZooKeeperMain.main(ZooKeeperMain.java:290)
Exception in thread "main" java.lang.IllegalArgumentException: A HostProvider may not be empty!
at org.apache.zookeeper.client.StaticHostProvider.(StaticHostProvider.java:88)
at org.apache.zookeeper.ZooKeeper.(ZooKeeper.java:449)
at org.apache.zookeeper.ZooKeeperMain.connectToZK(ZooKeeperMain.java:283)
at org.apache.zookeeper.ZooKeeperMain.(ZooKeeperMain.java:297)
at org.apache.zookeeper.ZooKeeperMain.main(ZooKeeperMain.java:290)

I get a error logs but nodes is runing