ansible roles例子

时间：2024-07-18 21:34:38
#理解

changed_when

failed_when

become

become_user

ansible_become

ansible_become_user

static

#检查group_vars中某组是否存在主机

- name: ensure only one monitoring host exists

  fail: msg="One, or no monitoring host may be specified."

  when: "groups.get('monitoring_servers', [])|length > 1"

#如果不定义值，那么使用默认值

- name: set deploy dir if not presented

  set_fact: deploy_dir="/home/{{deploy_user}}/deploy"

  when: deploy_dir is not defined

#禁掉swap

- name: disable swap

  shell: "([ $(swapon -s | wc -l) -ge 1 ] && (swapoff -a && echo disable)) || echo already"

  ignore_errors: yes

  register: swapoff_result

  changed_when: "swapoff_result.stdout.strip() == 'disable'"

#当set_timezone定义，设置相应时区

- name: set timezone to {{timezone}}

  timezone: name={{ timezone }}

  when: set_timezone

#设置hostname

- name: set hostname by ip

  hostname: name=ip-{{ ansible_default_ipv4.address | replace(".","-") }}

  register: hostname_set

  when:

    - set_hostname

    - "ansible_default_ipv4.address | replace('.','-') not in ansible_hostname"

#设置/etc/hosts

- name: inject hostname to hosts file

  lineinfile: dest=/etc/hosts line='127.0.0.1  ip-{{ ansible_default_ipv4.address | replace(\".\",\"-\") }}'

  when: set_hostname

'#修改文件中匹配到的某行

- name：modify centos irqbalance configuration file

  lineinfile:

    dest=/etc/default/irqbalance

    regexp='(?<!_)ONESHOT='

    line='ONESHOT=yes'

  when:

    - tuning_irqbalance_value

    - centos_irq_config_file.stat.exists

#检查umask

- name: get umask

  shell: umask

  register: umask

  changed_when: False

- name: does the system have a standard umask

  fail: 'The umask of the system ({{ umask.stdout.strip() }}) prevents successful installation. We suggest a standard umask such as 0022.'

  when: umask.stdout.strip()[-:] not in ('', '', '', '')

#根据facts值，检查系统版本

- name: check system version

  fail:

    msg: "Red Hat Enterprise Linux/CentOS 6 is deprecated"

  when: "ansible_os_family == 'RedHat' and ansible_distribution_major_version == '6"

#检查文件挂载点

- name: detemine which mountpoint depoly dir exists on

  shell: "df {{ deploy_dir }} | tail -n1 | awk '{print $NF}'"

  register: deploy_partition

  changed_when: False

#抓取log

- name: fetch pd log file

  fetch:

    src: "{{ log_dir }}/{{ inventory_hostname }}-pd.tar.gz"

    dest: "{{ fetch_tmp_dir }}/{{ inventory_hostname }}/"

    flat: yes

    validate_checksum: no

  when: "'pd_servers' in group_names"

#下载tidb二进制

- name: download tidb binary

  get_url:

    url: "{{ item.url }}"

    dest: "{{ doenloads_dir }}/{{ item.name }}-{{ item.version }}.tar.gz"

    checksum: "{{ item.checksum | default(omit) }}"

    force: yes

    validate_certs: no

  register: get_url_result

  until: "'OK' in get_url_result.msg or 'file already exists' in get_url_result.msg"

  retries:

  delay: "{{ retry_stagger | random + 3 }}"

  with_items: "{{ tidb_packages }}"

  when: has_outband_network

#debug

- debug:

    msg: "run command on server: {{ disk_randread_iops.cmd }}"

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