# 禁用系统swap
- name: 禁用系统 swap
  shell: "source /etc/profile; swapoff -a && sysctl -w vm.swappiness=0"
  ignore_errors: true

- name: 删除fstab swap 相关配置
  lineinfile:
    path: /etc/fstab
    regexp: 'swap'
    state: absent
    backup: 'yes'

- name: 加载内核模块
  modprobe: name={{ item }} state=present
  with_items:
    - br_netfilter
    - ip_vs
    - ip_vs_rr
    - ip_vs_wrr
    - ip_vs_sh
    - nf_conntrack
  ignore_errors: true

- name: 尝试加载nf_conntrack_ipv4
  shell: 'modprobe nf_conntrack_ipv4 || echo "NoFound"'
  register: NF_CONNTRACK_IPV4

- name: 启用systemd自动加载模块服务
  service: name=systemd-modules-load enabled=yes

- name: 增加内核模块开机加载配置
  template: src=10-k8s-modules.conf.j2 dest=/etc/modules-load.d/10-k8s-modules.conf

# 设置系统参数for k8s
# 消除docker info 警告WARNING: bridge-nf-call-ip[6]tables is disabled
# https://success.docker.com/article/ipvs-connection-timeout-issue 缩短keepalive_time超时时间为600s
- name: 设置系统参数
  template: src=95-k8s-sysctl.conf.j2 dest=/etc/sysctl.d/95-k8s-sysctl.conf

- name: 查看是否需要设置 fs.may_detach_mounts
  stat:
    path: /proc/sys/fs/may_detach_mounts
    get_attributes: no
    get_checksum: no
    get_mime: no
  register: fs_may_detach_mounts
  ignore_errors: true

- name: 当需要时，设置 fs.may_detach_mounts 为 1
  sysctl:
    sysctl_file: "/etc/sysctl.d/95-k8s-sysctl.conf"
    name: fs.may_detach_mounts
    value: 1
    state: present
    reload: yes
  when: fs_may_detach_mounts.stat.exists|bool

- name: 查看是否需要设置 net.ipv4.tcp_tw_recycle
  stat:
    path: /proc/sys/net/ipv4/tcp_tw_recycle
  register: tcp_tw_recycle
  ignore_errors: true

- name: 设置tcp_tw_recycle
  sysctl:
    sysctl_file: "/etc/sysctl.d/95-k8s-sysctl.conf"
    name: net.ipv4.tcp_tw_recycle
    value: 0
    state: present
    reload: yes
  when: tcp_tw_recycle.stat.exists|bool

- name: 生效系统参数
  shell: "source /etc/profile; sysctl -p /etc/sysctl.d/95-k8s-sysctl.conf"
  ignore_errors: true

# 设置系统 ulimits
- name: 创建 systemd 配置目录
  file: name=/etc/systemd/system.conf.d state=directory  

- name: 设置系统 ulimits
  template: src=30-k8s-ulimits.conf.j2 dest=/etc/systemd/system.conf.d/30-k8s-ulimits.conf

- name: 把SCTP列入内核模块黑名单
  copy: src=sctp.conf dest=/etc/modprobe.d/sctp.conf