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ansible啓動過程中，如果沒有運行，我使用ansible啓動NameNode的過程中，如果櫃面它不跑，我使用jps檢查過程和使用service_namenode_status檢查狀態，並開始使用service_namenode_start任何想法如何處理正確使用這個...？用ps
- name: Check if Namenode is running
shell: jps | grep " NameNode" | grep -v grep
ignore_errors: yes
changed_when: false
register: service_namenode_status
- name: Report status of Namenode
fail:
msg: |
Service NameNode is not running.
Return code from `jps | grep " NameNode" | grep -v grep`:
{{ service_namenode_status.rc }}
when: service_namenode_status.rc != 0
register: service_namenode_start
- name: Start Namenode
command: su - hdfs -c "/usr/hdp/current/hadoop-client/sbin/hadoop-daemon.sh --config $HADOOP_CONF_DIR start namenode"
tags: namenode
when: service_namenode_status.rc != 0
OUTPUT：
TASK [namenode : Check if Namenode is running] *********************************
fatal: [server1.hdp.vagrant.data.uc]: FAILED! => {"changed": false, "cmd": "jps | grep \" NameNode\" | grep -v grep", "delta": "0:00:00.192755", "end": "2016-11-09 10:59:10.360552", "failed": true, "rc": 1, "start": "2016-11-09 10:59:10.167797", "stderr": "", "stdout": "", "stdout_lines": [], "warnings": []}
...ignoring
TASK [namenode : Report status of Namenode] ************************************
fatal: [server1.hdp.vagrant.data.uc]: FAILED! => {"changed": false, "failed": true, "msg": "Service NameNode is not running.\nReturn code from `jps | grep \" NameNode\" | grep -v grep`:\n1 \n"}
NO MORE HOSTS LEFT *************************************************************
RUNNING HANDLER [metastore : restart postgresql] *******************************
to retry, use: --limit @/Users/krisdigitx/myLab/hdp/provisioning/site.retry
PLAY RECAP *********************************************************************
server1.hdp.vagrant.data.uc : ok=86 changed=32 unreachable=0 failed=1
Ansible failed to complete successfully. Any error output should be
visible above. Please fix these errors and try again.