生成的 podman systemd 文件无法启用

Posted 2023-03-24

【中文标题】生成的 podman systemd 文件无法启用

【英文标题】：Generated podman systemd file can not be enabled

【发布时间】：2021-11-17 17:46:28

【问题描述】：

我正在尝试编写一个 ansible playbook，它将 nginx 部署为 podman 容器，生成与所述容器相关的 systemd 单元并启用并启动该 systemd 单元。容器本身创建良好并且已启动并运行，但系统无法识别创建的单元文件。容器创建后ansible playbook相关部分如下

---
- name: Create systemd script for created container
  become: true
  shell: podman generate systemd -n nginx --files
  register: container_systemd_file

- name: Get service name
  set_fact: 
    service_name: " container_systemd_file.stdout | basename "

- name: Move created systemd script to correct location
  become: true
  shell: mv  container_systemd_file.stdout  /etc/systemd/system/

- name: Force systemd to reread configs
  become: true
  systemd: daemon_reload=yes

- name: Enable nginx container service
  become: true
  systemd:
    name: " service_name "
    enabled: true
    state: started

最后一步失败并显示消息"msg": "Could not find the requested service container-nginx.service: host"。

单元文件可以在宿主机上找到

$ ls -al /etc/systemd/system/container-nginx.service 
-rw-r--r--. 1 root root 701 Sep 24 15:19 /etc/systemd/system/container-nginx.service

有内容

# container-nginx.service
# autogenerated by Podman 3.2.3
# Fri Sep 24 15:19:41 EEST 2021

[Unit]
Description=Podman container-nginx.service
Documentation=man:podman-generate-systemd(1)
Wants=network.target
After=network-online.target
RequiresMountsFor=/var/run/containers/storage

[Service]
Environment=PODMAN_SYSTEMD_UNIT=%n
Restart=on-failure
TimeoutStopSec=70
ExecStart=/usr/bin/podman start nginx
ExecStop=/usr/bin/podman stop -t 10 nginx
ExecStopPost=/usr/bin/podman stop -t 10 nginx
PIDFile=/var/run/containers/storage/overlay-containers/c5ad5d961913a8d48ea09557484eaf17749086581eb5a1750e65fb4cf8965272/userdata/conmon.pid
Type=forking

[Install]
WantedBy=multi-user.target default.target

同样，如果我运行 systemctl daemon-reload 并尝试在主机上手动启用该服务，它会失败并显示消息 Failed to enable unit: Unit file container-nginx.service does not exist.

如何让系统识别新创建的单元文件并启用服务？我正在使用 Podman 3.2.3 和 RHEL 8.4。

【参考方案1】：

我无法弄清楚为什么最初的方法不起作用，而是首先将 systemd 单元作为文件生成到用户的主目录然后移动它，而是直接将文件写入 /etc/systemd/system/ 下工作。

---
- name: Create systemd script for created container
  become: true
  shell: podman generate systemd --new --name nginx > /etc/systemd/system/nginx.service

- name: Force systemd to reread configs
  become: true
  systemd: daemon_reload=yes

- name: Enable nginx container service
  become: true
  systemd:
    name: nginx.service
    enabled: true
    state: started