使用ansible批量修改主机名后/etc/hosts文件不能被正确修改的修复方法
我前面一篇文章讲述了如何这ansible中批量修改主机名，但是上面没有经过严格的测试。
使用hostname模块修改主机名之后，/etc/hosts里的内容是并没有修改的
这里会造成一个问题，如果hosts里的的主机名没有被绑定，那么我们SSH的时候会造成问题，出现主机名无法解析的现象
解决办法。我这里是ubuntu的机器 centos的还没测试过
jastme@jastme2:~$ more /etc/nsswitch.conf # /etc/nsswitch.conf # # Example configuration of GNU Name Service Switch functionality. # If you have the `glibc-doc-reference' and `info' packages installed, try: # `info libc "Name Service Switch"' for information about this file. passwd: compat group: compat shadow: compat #hosts: files dns 换成下面的，取消DNS的解析 hosts: files networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis
再/etc/ssh/sshd_config中 加入 UseDNS no
以上解决办法可以消除掉hosts文件未被修改而导致ansible运行出错的问题
如何解决这个问题，使用ansible修改主机名，然后再修改hosts文件？
root@ansible:/etc/ansible# pwd /etc/ansible root@ansible:/etc/ansible# tree . ├── ansible.cfg ├── hosts └── playbooks ├── hosts.yml ├── script │ └── test.sh ├── source ├── templates │ ├── hosts.j2 │ ├── nrpe.cfg │ ├── nrpe.j2 │ ├── profile │ ├── showtime │ └── test.j2 └── test.yml 4 directories, 11 files root@ansible:/etc/ansible#
playbook
root@ansible:/etc/ansible# cat playbooks/test.yml
- hosts : test
remote_user : jastme
# gather_facts : no
sudo : yes
tasks:
- name : install packetages on ubuntu
apt : pkg={{ item }} state=present update_cache=no cache_valid_time=36000 force=yes
# sudo : yes
# debug : "{{ item }}"
when : ansible_distribution == "Ubuntu"
with_items :
- gcc
- g++
- nginx
- name : install packetpages on centos
# yum: name="@Development tools" state=present
yum: name={{ item }} state=present
when : ansible_distribution == "RedHat"
with_items :
- gcc
- g++
- nginx
- name : excute local script on client
script : script/test.sh #with local script , same as iterable ===with_lines===
- name : change the client hostname by clinet app+ipadd #在这里我们修改了主机名
hostname : name=web{{ ansible_eth1.ipv4.address.split('.')[-1] }}
# - include : hosts.yml
- name : gather facts again #重新获取一次facts,如果不重新获取，hosts.j2文件中的 {{ ansible_hostname }} 变量仍然是修改之前的值
setup :
- name : change the hosts file because the hosts file not change by ansible hostname module #替换文件
template : src=templates/hosts.j2 dest=/etc/hosts
- name : copy j2 file by template moulde
template : src=templates/test.j2 dest=/tmp/test.txt mode=0700
notify :
- jastme # call the handler which name is jastme
- name : test the nrpe config file by templat
template : src=templates/nrpe.j2 dest=/tmp/nrpe.cfg
notify :
- restart nrpe
- name : copy the nrpe cfg to nrpe dir
copy : src=templates/showtime dest=/tmp/showtime #module copies a file on the local box to remote
handlers:
- name : jastme
command : echo "jastme is here"
- name : restart nrpe
shell : killall nrpe;/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d
- name : change the hosts file because the hosts file not change by ansible hostname module
template : src=templates/hosts.j2 dest=/etc/hosts
hosts.j2
root@ansible:/etc/ansible# cat playbooks/templates/hosts.j2
127.0.0.1 localhost {{ ansible_hostname }}
验证
修改之前的
jastme@hello2:~$ cat /etc/hosts 127.0.0.1 localhost hello2 jastme@hello2:~$ cat /etc/hostname hello2 jastme@hello2:~$ hostname hello2
测试下结果
root@ansible:/etc/ansible# ansible-playbook playbooks/test.yml -K -vv
sudo password:
PLAY [test] *******************************************************************
GATHERING FACTS ***************************************************************
<192.168.1.2> REMOTE_MODULE setup
ok: [192.168.1.2]
TASK: [install packetages on ubuntu] ******************************************
<192.168.1.2> REMOTE_MODULE apt pkg=gcc,g++,nginx state=present update_cache=no cache_valid_time=36000 force=yes
ok: [192.168.1.2] => (item=gcc,g++,nginx) => {"changed": false, "item": "gcc,g++,nginx"}
TASK: [install packetpages on centos] *****************************************
skipping: [192.168.1.2]
TASK: [excute local script on client] *****************************************
changed: [192.168.1.2] => {"changed": true, "rc": 0, "stderr": "", "stdout": "\r\nSUDO-SUCCESS-bcmzwtkepywyexpkhjtrjdvcodebaqer\r\nhello2\r\n"}
TASK: [change the client hostname by clinet app+ipadd] ************************
<192.168.1.2> REMOTE_MODULE hostname name=web2
changed: [192.168.1.2] => {"changed": true, "name": "web2"}
TASK: [gather facts again] ****************************************************
<192.168.1.2> REMOTE_MODULE setup
ok: [192.168.1.2]
TASK: [change the hosts file because the hosts file not change by ansible hostname module] ***
changed: [192.168.1.2] => {"changed": true, "dest": "/etc/hosts", "gid": 0, "group": "root", "md5sum": "91d555f2278a5d5ceef39fd460a03e78", "mode": "0644", "owner": "root", "size": 25, "src": "/home/jastme/.ansible/tmp/ansible-tmp-1458962053.13-120793882613399/source", "state": "file", "uid": 0}
TASK: [copy j2 file by template moulde] ***************************************
changed: [192.168.1.2] => {"changed": true, "dest": "/tmp/test.txt", "gid": 1000, "group": "jastme", "md5sum": "a0462664fea4fba50e80f4f863d46f52", "mode": "0700", "owner": "jastme", "size": 16, "src": "/home/jastme/.ansible/tmp/ansible-tmp-1458962053.29-203298900062115/source", "state": "file", "uid": 1000}
TASK: [test the nrpe config file by templat] **********************************
ok: [192.168.1.2] => {"changed": false, "gid": 1000, "group": "jastme", "mode": "0600", "owner": "jastme", "path": "/tmp/nrpe.cfg", "size": 1706, "state": "file", "uid": 1000}
TASK: [copy the nrpe cfg to nrpe dir] *****************************************
ok: [192.168.1.2] => {"changed": false, "dest": "/tmp/showtime", "gid": 1000, "group": "jastme", "md5sum": "d41d8cd98f00b204e9800998ecf8427e", "mode": "0644", "owner": "jastme", "path": "/tmp/showtime", "size": 0, "state": "file", "uid": 1000}
NOTIFIED: [jastme] ************************************************************
<192.168.1.2> REMOTE_MODULE command echo "jastme is here"
changed: [192.168.1.2] => {"changed": true, "cmd": ["echo", "jastme is here"], "delta": "0:00:00.001353", "end": "2016-03-26 11:14:13.754484", "rc": 0, "start": "2016-03-26 11:14:13.753131", "stderr": "", "stdout": "jastme is here"}
PLAY RECAP ********************************************************************
192.168.1.2 : ok=10 changed=5 unreachable=0 failed=0
看看客户端的结果
jastme@hello2:~$ cat /etc/hosts 127.0.0.1 localhost web2 jastme@hello2:~$ cat /etc/hostname web2 jastme@hello2:~$ hostname web2 jastme@hello2:~$
成功了