没有系统化，想到哪里就写到哪里

centos6.5_x64下修改root和普通用户的ulimit 值

cat /etc/security/limits.conf

* soft nofile 65535
* hard nofile 65535

[hehe@centos65-1-43 ~]$ ulimit -n
65535
[hehe@centos65-1-43 ~]$

centos7.2_x64下也是修改相同位置，不过貌似要重启系统

最近在用ansible，被控端为centos7.2。下面的命令执行都是ok的，现在要将他们转换成playbooks模板，即后缀为yml的文件。

ansible webservers -m shell -a "yum -y install crontabs"
ansible webservers -m shell -a "/bin/systemctl start  crond.service"
ansible webservers -m shell -a "rpm -ivh http://repo.zabbix.com/zabbix/3.2/rhel/7/x86_64/zabbix-release-3.2-1.el7.noarch.rpm"
ansible webservers -m shell -a "yum install zabbix-agent -y"
ansible webservers -m shell -a "mkdir -p /etc/zabbix/scripts"
ansible webservers -m copy -a "src=http://www.mamicode.com/root/webservers.py dest=/etc/zabbix/scripts/ owner=root group=root mode=0755"
ansible webservers -m copy -a "src=http://www.mamicode.com/root/weifuwu.sh dest=/etc/zabbix/scripts/ owner=root group=root mode=0755"
ansible webservers -m copy -a "src=http://www.mamicode.com/root/zabbix_agentd.conf dest=/etc/zabbix/zabbix_agentd.conf"
ansible webservers -m shell -a "/usr/sbin/zabbix_agentd -c /etc/zabbix/zabbix_agentd.conf"
ansible webservers -m cron -a "minute=‘*/5‘ job=‘/usr/bin/python /etc/zabbix/scripts/webservers.py >/dev/null 2>&1‘"

写了很多次都是失败的

[root@centos65-1-43 ~]# cat /etc/ansible/hosts
[webservers]
192.168.1.62

- name: zabbix_client
   hosts: webservers
   user: root
   tasks:
   - name: install crontabs
     yum: pkg=crontabs state=latest
     notify:
     - restart crontabs
   tasks:
   - name: install zabbix_epel
     command: rpm -ivh http://repo.zabbix.com/zabbix/3.2/rhel/7/x86_64/zabbix-release-3.2-1.el7.noarch.rpm
   - name: install zabbix_agentd
     yum: pkg=zabbix-agent state=latest
   - name: mkdir
     command: mkdir -p /etc/zabbix/scripts
   - name: copy files
     copy: src=http://www.mamicode.com/root/webservers.py dest=/etc/zabbix/scripts/
   - name: start zabbix-agentd
     command: /usr/sbin/zabbix_agentd -c /etc/zabbix/zabbix_agentd.conf
   - name: make crontab
     cron: minute=‘*/5‘ job=‘/usr/bin/python /etc/zabbix/scripts/webservers.py >/dev/null 2>&1‘
   handlers:
     - name: restart crontabs
       service: name=crond state=restarted

经常因为网络不好找不到yum源导致执行的失败而跳出

TASK [install zabbix_agentd] ******************************************************************************************************************************
fatal: [192.168.1.62]: FAILED! => {"changed": true, "failed": true, "msg": "http://repo.zabbix.com/zabbix/3.2/rhel/7/x86_64/zabbix-agent-3.2.7-1.el7.x86_64.rpm: [Errno 14] HTTP Error 404 - Not Found\nTrying other mirror.\nTo address this issue please refer to the below knowledge base article \n\nhttps://access.redhat.com/articles/1320623\n\nIf above article doesn‘t help to resolve this issue please create a bug on https://bugs.centos.org/\n\n\n\nError downloading packages:\n  zabbix-agent-3.2.7-1.el7.x86_64: [Errno 256] No more mirrors to try.\n\n", "rc": 1, "results": ["Loaded plugins: fastestmirror, langpacks\nLoading mirror speeds from cached hostfile\n * epel: mirrors.ustc.edu.cn\nResolving Dependencies\n--> Running transaction check\n---> Package zabbix-agent.x86_64 0:3.2.7-1.el7 will be installed\n--> Finished Dependency Resolution\n\nDependencies Resolved\n\n================================================================================\n Package              Arch           Version               Repository      Size\n================================================================================\nInstalling:\n zabbix-agent         x86_64         3.2.7-1.el7           zabbix         345 k\n\nTransaction Summary\n================================================================================\nInstall  1 Package\n\nTotal download size: 345 k\nInstalled size: 1.3 M\nDownloading packages:\n"]}
         to retry, use: --limit @/root/0801.retry

学习杂记20170801