Namanode 高可用 主备节点切换

Posted 2022-12-28 闭关苦炼内功

注意：

namenode 的节点 对应 的 主机节点：

nn1 bigdata02
nn2 bigdtata03

---

• 查看 namenode 节点状态 active/standby
  ssh bigdata02 "su - hdfs -c 'hdfs haadmin -getServiceState nn1'"
ssh bigdata03 "su - hdfs -c 'hdfs haadmin -getServiceState nn2'"

root@bigdata01 ~/bin # cat ha_nn1.sh
#!/bin/bash

ssh bigdata02 "su - hdfs -c 'hdfs haadmin -getServiceState nn1'"
root@bigdata01 ~/bin #

root@bigdata01 ~/bin # ./ha_nn1.sh
active
root@bigdata01 ~/bin #

root@bigdata01 ~/bin # cat ha_nn2.sh
#!/bin/bash

ssh bigdata03 "su - hdfs -c 'hdfs haadmin -getServiceState nn2'"
root@bigdata01 ~/bin #

root@bigdata01 ~/bin # ./ha_nn2.sh
standby
root@bigdata01 ~/bin #

• 主备节点切换

ssh bigdata02 "su - hdfs -c 'hdfs haadmin -transitionToActive --forcemanual nn1'"

ssh bigdata02 "su - hdfs -c 'hdfs haadmin -transitionToActive --forcemanual nn2'"

root@bigdata01 ~/bin # cat ha_standby2active_nn1.sh
#!/bin/bash

# active nn1
ssh bigdata02 "su - hdfs -c 'hdfs haadmin -transitionToActive --forcemanual nn1'"

# active nn2
# ssh bigdata02 "su - hdfs -c 'hdfs haadmin -transitionToActive --forcemanual nn2'"

root@bigdata01 ~/bin #
root@bigdata01 ~/bin # cat ha_standby2active_nn2.sh
#!/bin/bash

# active nn1
# ssh bigdata02 "su - hdfs -c 'hdfs haadmin -transitionToActive --forcemanual nn1'"

# active nn2
ssh bigdata02 "su - hdfs -c 'hdfs haadmin -transitionToActive --forcemanual nn2'"

root@bigdata01 ~/bin #