CentOS7 dns自動覆蓋

centos7 阿里雲ecs系統重啟後，/etc/resolv.conf 會被dhclient 或者networkmanager還原為預設配置/清空

1. peerdns=yes|no 允許|禁止/etc/resolv.conf 重啟/更新網路 被覆蓋

2. 當開啟networkmanager.service 時, peerdns是不生效的，通過設定dns=none解決

3. 阿里雲ecs內部服務不要開啟networkmanager, 可能導致網路不可用

系統初始化時：

1. /etc/resolv.conf template乙份
2. 通過ansible的lineinfile 只增加一行peerdns=no

系統初始化時：

1. /etc/resolv.conf template乙份
2. 通過ansible的lineinfile 只增加一行peerdns=no

- block:

- name: modify /etc/resolv.conf
template:
src: resolv.conf.j2
dest: /etc/resolv.conf
mode: 0644
owner: root
group: root
- name: install common operate utils
yum:
name: "}"
update_cache: yes
with_items: ["htop", "iftop", "nload", "iptraf", "dstat", "iotop", "screen", "hping3"]
- name: modify ifcfg-etho to forbid autoupdate dns
lineinfile:
dest: /etc/sysconfig/network-scripts/ifcfg-eth0
state: present
line: 'peerdns=no'
mode: 0644
owner: root
group: root
when: ansible_distribution == "centos"
tags: update_dns

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