每日消息MOTD在Ubuntu 18.04中无法使用

如何解决每日消息MOTD在Ubuntu 18.04中无法使用

我无法将当天的消息显示在我的流浪汉框中，我想知道为什么。 我created a gist for a reproducible example here（其中包含Vagrantfile和playbook.yml个文件）。

这是我的Vagrantfile：

Vagrant.require_version ">= 2.2.3"

Vagrant.configure("2") do |config|
  config.vm.provider "virtualbox" do |v|
    v.memory = 2048
    v.cpus = 2
  end  
  config.vm.box = "ubuntu/bionic64"
  config.vm.hostname = "cli-tools"
  config.vm.provision "ansible",type: "ansible" do |ansible|
    ansible.playbook = "playbook.yml"
  end

  config.ssh.extra_args = ["-t","zsh; cd /home/vagrant"]
  config.ssh.forward_x11 = true
end

我为我的盒子设置了ansible，在那里我还创建了/etc/update-motd.d/01-custom文件。 第一行是#!/bin/sh。 最后一行是exit 0。

运行sudo run-parts /etc/update-motd.d/ > /dev/null不会显示任何内容（按预期）。

与其他脚本一样设置权限：

vagrant:~/ $ ls -la /etc/update-motd.d/                                                                                                                                                                                                             
total 64
drwxr-xr-x  2 root root 4096 Aug 20 09:14 .
drwxr-xr-x 97 root root 4096 Aug 20 08:16 ..
-rwxr-xr-x  1 root root 1220 Apr  9  2018 00-header
-rwxr-xr-x  1 root root 2387 Aug 20 09:14 01-custom

我的/etc/ssh/sshd_config包含以下设置：

...
UsePAM yes

#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
X11Forwarding yes
#X11DisplayOffset 10
#X11UseLocalhost yes
#PermitTTY yes
PrintMotd yes
...

/etc/pam.d/sshd中的小球配置：

...
# Print the message of the day upon successful login.
# This includes a dynamically generated part from /run/motd.dynamic
# and a static (admin-editable) part from /etc/motd.
session    optional     pam_motd.so  motd=/run/motd.dynamic
session    optional     pam_motd.so noupdate
...

这里是playbook.yml

- hosts: all
  tasks:
    - name: Update apt cache
      apt:
        update_cache: yes
      become: yes

    - name: Install zsh
      apt:
        name: zsh
        state: present
      become: yes

    - name: Check current shell
      shell: if echo $0 = "zsh" ; then echo "true"; else echo "false"; fi
      register: zsh

    - name: Change default shell to zsh
      shell: 'sudo chsh -s /bin/zsh vagrant'
      when: zsh.stdout == "false"

    - name: Check if Oh My Zsh is already installed
      shell: '[ -d "/home/vagrant/.oh-my-zsh" ] && echo "true" || echo "false"'
      register: ohmyzsh_present

    - name: Install Oh My Zsh (it can take several minutes to complete)
      shell: 'sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)" "" --unattended'
      when: ohmyzsh_present.stdout == "false"

    - name: Check that the message of the day (motd) file.conf exists
      stat:
        path: /etc/update-motd.d/01-custom
      register: motd_custom

    - name: Create the message of the day (motd) file,if it doesnt exist already (/etc/update-motd.d/01-custom)
      file:
        path: /etc/update-motd.d/01-custom
        state: touch
        mode: 0755
        owner: root
        group: root
      become: yes
      become_user: root
      when: not motd_custom.stat.exists

    - name: Set message of the day (motd)
      blockinfile:
        path: /etc/update-motd.d/01-custom
        marker: ''
        block: |
          #!/bin/sh
          # System Overview
          echo "\033[33;1m\nSystem Overview\n\033[0m"
          /usr/bin/landscape-sysinfo

          # System Updates
          echo "\033[33;1m\nSystem Updates\n\033[0m"
          /usr/lib/update-notifier/apt-check --human-readable
          exit 0
      become: yes
      become_user: root
      when: not motd_custom.stat.exists

    - name: Remove blank lines blockinfile put in
      lineinfile :
        path: /etc/update-motd.d/01-custom
        state: absent
        regexp: '^$'
      become: yes
      become_user: root

    - name: update ssh config file to add the motd
      shell: 'sed -i "s/.*PrintMotd.*/PrintMotd yes/g" /etc/ssh/sshd_config && sudo service ssh restart'
      become: yes
      become_user: root
      when: not motd_custom.stat.exists

我在包装盒内使用oh-my-zsh，可能是那里的问题吗？ 从全球范围来看，我从来没有流浪汉出现过任何“伤痕”。 我在这里想念什么？

解决方法

添加motd文件（或在其中进行任何更改）后，应运行service motd-news restart或使用Ansible服务模块重新启动motd-news。

FWIW您也可以使用Ansible User模块将用户的shell设置为zsh，而不必检查当前shell是什么。这将允许您删除外壳检查任务。