RH358配置链路聚合--自动化管理网络组

RH358配置链路聚合–自动化管理网络组

RH358课程在每章的最后一个章节内容都是讲解如何使用Ansible对本章所学进行自动化管理。所以需要你有Ansible的基础。若对Ansible感兴趣，可订阅金鱼哥写的Ansible专栏。本章节属于第二章第三节内容。

专栏地址：https://blog.csdn.net/qq_41765918/category_11532281.html

1. 使用Ansible配置网络组

rhel-system-roles包中提供的rhel-system-roles.network角色可用于自动化网络组的配置。

记住，这个角色是由Ansible控制节点上的/usr/share/ansible/roles目录中的包安装的，默认情况下，该目录位于本地安装角色的Ansible搜索路径中。

编写一个Ansible剧本来创建一个网络组

使用组接口及其端口所需的配置来设置network_connections变量。

用组接口(主接口)的定义开始network_connections变量的定义。下面的示例为名为team0的组接口配置名为team0的连接，该接口使用DHCP配置其IP地址。默认情况下，它使用rounddrobin运行器。

- name: Configure team interface
  hosts: servers
  vars:
    network_connections:
      - name: team0
        state: up
        type: team
        interface_name: team0
        
  roles:
    - rhel-system-roles.network

• name变量定义NetworkManager连接名称。

• interface_name的值决定了所创建的网络接口设备的名称。

• 对于组接口，类型变量的值必须设置为team。

• 在角色定义中，调用rhel-system-roles.network角色

为每个端口接口添加额外的变量定义:

• 将name设置为端口接口的唯一连接名称。

• interface_ name设置为指定端口接口的网络设备名称。

• 将master设置为组接口的接口名称。

- name: Configure team interface
  hosts: servers
  vars:
    network_connections:
      - name: team0
        state: up
        type: team
        interface_name: team0
        
      - name: team0-enp7s0
        state: up
        type: ethernet
        interface_name: enp7s0
        master: team0
        
      - name: team0-enp8s0
        state: up
        type: ethernet
        interface_name: enp8s0
        master: team0
        
  roles:
    - rhel-system-roles.network

在前面的示例中，enp7so和enp8s0是现有的以太网网络接口，它们被用作组网络接口的物理端口。如果两个端口都有运营商信号并访问DHCP服务器，组接口将启动并在其中一个端口启动时被分配一个IP地址。

创建一个静态IP地址的网络组

通过设置一个包含一个或多个地址值列表的ip变量，可以选择为组接口分配静态网络地址。

下面以team0接口配置一个名为team0的连接为例，该连接静态分配的IPv4地址为172.25.250.30/24。端口接口的配置设置还没有包括在这个剧本中。

- name: Configure team interface
  hosts: servers
  vars:
    network_connections:
      - name: team0
        state: up
        type: team
        interface_name: team0
        ip:
          address:
            - 172.25.250.30/24

有一种更好的方法可以使用这个网络角色来配置许多服务器。将每个主机的team0的静态IP地址分配给host_vars文件中的一个变量。

- name: Configure team interface
  hosts: servers
  vars:
    network_connections:
      - name: team0
        state: up
        type: team
        interface_name: team0
        ip:
          address:
            - "{
    { team0_static_ip }}"
            
      - name: team0-enp7s0
        state: up
        type: ethernet
        interface_name: enp7s0
        master: team0
        
      - name: team0-enp8s0
        state: up
        type: ethernet
        interface_name: enp8s0
        master: team0
        
  roles:
    - rhel-system-roles.network

配置组接口运行器

当前rhel-system-roles .network角色的实现有一些限制。其中之一是，它不能用于设置组界面的运行器。然而，使用Ansible还有其他方法来实现这一点。

使用command命令模块直接运行nmcli来调整运行器，然后断开连接并重新连接以更新其设置。下面的示例添加了一个任务来完成此任务。它在报告更改时调用两个处理程序重新启动连接:

- name: Configure team interface
  hosts: servers
  vars:
    network_connections:
      - name: team0
        state: up
        type: team
        interface_name: team0
        ip:
          address:
            - "{
    { team0_static_ip }}"
            
      - name: team0-enp7s0
        state: up
        type: ethernet
        interface_name: enp7s0
        master: team0
        
      - name: team0-enp8s0
        state: up
        type: ethernet
        interface_name: enp8s0
        master: team0
        
  roles:
    - rhel-system-roles.network
  
  tasks:
    - name: Adjust team0 runner
      command: /usr/bin/nmcli con mod team0 team.runner activebackup
      notify: restart team0

  handlers:
    - name: disconnect team0
      command: /usr/bin/nmcli dev dis team0
      listen: restart team0
    - name: start team0
      command: /usr/bin/nmcli con up team0
      listen: restart team0

这个例子确实有一个问题。命令任务不是幂等的，即使team0的运行器已经设置为activebackup，它也将运行。即使不需要这样做，也会再次关闭和启动组接口，这可能会中断网络连接。

为了解决这个问题，添加一些任务来帮助根据组的状态有条件地运行那些其他任务:

- name: Configure team interface
  hosts: servers
  vars:
    network_connections:
      - name: team0
        state: up
        type: team
        interface_name: team0
        ip:
          address:
            - "{
    { team0_static_ip }}"
            
      - name: team0-enp7s0
        state: up
        type: ethernet
        interface_name: enp7s0
        master: team0
        
      - name: team0-enp8s0
        state: up
        type: ethernet
        interface_name: enp8s0
        master: team0
        
  tasks:
    - name: Is team0 defined?
      include_role:
        name: rhel-system-roles.network
      when: ansible_facts['team0'] is not defined
      
    - name: Check team0 status
      command: /usr/bin/teamdctl team0 state dump
      register: team0_state
      changed_when: false
      
    - name: Import team0 status as JSON
      set_fact:
        team0_status: "{
    { team0_state.stdout }}"
      
    - name: Adjust team runner
      command: /usr/bin/nmcli con mod team0 team.runner activebackup
      notify: restart team0
      when:
        - team0_status['setup']['runner_name'] != "activebackup"

  handlers:
    - name: disconnect team0
      command: /usr/bin/nmcli dev dis team0
      listen: restart team0
    - name: start team0
      command: /usr/bin/nmcli con up team0
      listen: restart team0

• rhel-system-roles.network角色现在使用include_role作为任务调用，这样它就可以有一个条件，只在team0接口不存在的情况下运行。

• 当team0存在时，teamdctl team0 state dump的结果将保存到已注册的变量中。此任务总是报告changed更改，但由于它在托管主机上没有更改任何内容，因此将change when: false设置为ok。

• set_fact模块确保teamdctl的标准输出，它是json格式化的，包含了接口的状态，可以像对待变量字典一样对待。

• 该输出用于确保组的runner仅在尚未设置为activebackup时才更改。

删除组接口

rhel-system-roles.network角色和命令模块可以使用nmcli来删除组接口。您需要删除组接口及其端口的NetworkManager连接，并断开team0接口以立即将其关闭。

在下面的例子中，当未定义team0 网络组时，Ansible条件将阻止任务运行。

- name: Remove team0 interface
  hosts: servers
  become: yes
  vars:
    network_connections:
      - name: team0
        persistent_state: absent
      - name: team0-enp7s0
        persistent_state: absent
      - name: team0-enp8s0
        persistent_state: absent

  tasks:
    - name: Deactivate team0
      include_role:
        name: rhel-system-roles.network
      when: ansible_facts['team0'] is defined
    - name: Disconnect team0
      command: /usr/bin/nmcli dev dis team0
      when: ansible_facts['team0'] is defined

2. 课本练习

[student@workstation ~]$ lab netlink-automation start

1. 明确已有项目文件。

[student@workstation ~]$ cd ~/netlink-automation
[student@workstation netlink-automation]$ cat ansible.cfg 
[defaults]
inventory=inventory
remote_user=devops

[privilege_escalation]
become=False
become_method=sudo
become_user=root
become_ask_pass=False

[student@workstation netlink-automation]$ cat inventory 
[servers]
servera.lab.example.com

2. 使用ansible-galaxy命令检查系统角色是否可用

[student@workstation netlink-automation]$ ansible-galaxy list
# /usr/share/ansible/roles
- linux-system-roles.kdump, (unknown version)
- linux-system-roles.network, (unknown version)
- linux-system-roles.postfix, (unknown version)
- linux-system-roles.selinux, (unknown version)
- linux-system-roles.storage, (unknown version)
- linux-system-roles.timesync, (unknown version)
- rhel-system-roles.kdump, (unknown version)
- rhel-system-roles.network, (unknown version)
- rhel-system-roles.postfix, (unknown version)
- rhel-system-roles.selinux, (unknown version)
- rhel-system-roles.storage, (unknown version)
- rhel-system-roles.timesync, (unknown version)
# /etc/ansible/roles
[WARNING]: - the configured path /home/student/.ansible/roles does not exist.

3. 按要求编写创建网络组。

[student@workstation netlink-automation]$ cat playbook.yml 
---
- name: Configure team network device
  hosts: servers
  become: true
  vars:
    network_connections:
  #Create a team profile
      - name: team0
        state: up
        type: team
        interface_name: team0
        ip:
          dhcp4: no
          auto6: no
          address:
            - "192.168.0.100/24"

      - name: team0-port1
        state: up
        type: ethernet
        interface_name: eth1
        master: team0

      - name: team0-port2
        state: up
        type: ethernet
        interface_name: eth2
        master: team0

  roles:
    - rhel-system-roles.network

4. 运行剧本。

[student@workstation netlink-automation]$ ansible-playbook playbook.yml --syntax-check

playbook: playbook.yml
[student@workstation netlink-automation]$ ansible-playbook playbook.yml

5. 确认已在服务器上创建网络组。

[root@servera ~]# teamdctl team0 state
setup:
  runner: roundrobin
ports:
  eth1
    link watches:
      link summary: up
      instance[link_watch_0]:
        name: ethtool
        link: up
        down count: 0
  eth2
    link watches:
      link summary: up
      instance[link_watch_0]:
        name: ethtool
        link: up
        down count: 0

[root@servera ~]# ping 192.168.0.254

6. 使用Ansible确认网络组正在工作。

[student@workstation netlink-automation]$ vim teamtest.yml
---
- name: Configure team network device
  hosts: servers
  become: true
  tasks:
    - name: Confirm team interface functions
      command: ping -c1 -w2 192.168.0.254
[student@workstation netlink-automation]$ ansible-playbook teamtest.yml

7. 调整网络组使用不同的运行器。

[student@workstation netlink-automation]$ vim teamtune.yml
---
- name: Tune team network device
  hosts: servers
  become: true

  tasks:
    - name: Tune team runner to activebackup
      command: nmcli con mod team0 team.runner activebackup

    - name: Disconnect team interface
      command: nmcli dev dis team0
    - name: Reactivate team interface
      command: nmcli con up team0
[student@workstation netlink-automation]$ ansible-playbook teamtune.yml

8. 验证team0使用activebackup运行程序。

[root@servera ~]# teamdctl team0 state
setup:
  runner: activebackup
ports:
  eth1
    link watches:
      link summary: up
      instance[link_watch_0]:
        name: ethtool
        link: up
        down count: 0
  eth2
    link watches:
      link summary: up
      instance[link_watch_0]:
        name: ethtool
        link: up
        down count: 0
runner:
  active port: eth1
[root@servera ~]# ping -c2 192.168.0.254

完成实验

[student@workstation ~]$ lab netlink-automation finish

总结

• 介绍如何使用Ansible配置网络组。
• 网络组的自动化日常管理。
• 若喜欢金鱼哥的文章，顺手点个赞。也可点个关注，因为后续会不断上干货。