红帽全球峰会3.5. 重启容器
由于 podman 不支持 --restart 选项，所以您可以将 podman 配置为 systemd 服务，如使用 Podman 将容器迁移到 systemd所述
3.5.1. 使用 Podman 的 systemd 单元文件
默认情况下，Podman 为现有容器或 pod 生成一个单元文件。您可以使用 podman generate systemd --new 命令生成更多可移植的 systemd 单元文件。--new 标志指示 Podman 生成创建、启动和删除容器的单元文件。
从正在运行的 Red Hat Quay registry 中创建 systemd 单元文件，如下所示：
$ sudo podman generate systemd --new --files --name redis $ sudo podman generate systemd --new --files --name postgresql-quay $ sudo podman generate systemd --new --files --name quay $ sudo podman generate systemd --new --files --name postgresql-clairv4 $ sudo podman generate systemd --new --files --name clairv4将单元文件复制到
/usr/lib/systemd/system中以 root 用户身份安装它们：$ sudo cp -Z container-redis.service /usr/lib/systemd/system $ sudo cp -Z container-postgresql-quay.service /usr/lib/systemd/system $ sudo cp -Z container-quay.service /usr/lib/systemd/system $ sudo cp -Z container-postgresql-clairv4.service /usr/lib/systemd/system $ sudo cp -Z container-clairv4.service /usr/lib/systemd/system重新载入 systemd Manager 配置：
$ sudo systemctl daemon-reload启用服务并在引导时启动它们：
$ sudo systemctl enable --now container-redis.service $ sudo systemctl enable --now container-postgresql-quay.service $ sudo systemctl enable --now container-quay.service $ sudo systemctl enable --now container-postgresql-clairv4.service $ sudo systemctl enable --now container-clairv4.service
3.5.2. 启动、停止和检查服务的状态
检查 Quay 组件的状态：
$ sudo systemctl status container-redis.service $ sudo systemctl status container-postgresql-quay.service $ sudo systemctl status container-quay.service $ sudo systemctl status container-postgresql-clairv4.service $ sudo systemctl status container-clairv4.service停止 Quay 组件服务：
$ sudo systemctl stop container-redis.service $ sudo systemctl stop container-postgresql-quay.service $ sudo systemctl stop container-quay.service $ sudo systemctl stop container-postgresql-clairv4.service $ sudo systemctl stop container-clairv4.service启动 Quay 组件服务：
$ sudo systemctl start container-redis.service $ sudo systemctl start container-postgresql-quay.service $ sudo systemctl start container-quay.service $ sudo systemctl start container-postgresql-clairv4.service $ sudo systemctl start container-clairv4.service
3.5.3. 重启后测试重启
配置并启用服务后，重启该系统。当系统重新启动后，使用 podman ps 检查 Quay 组件的所有容器是否已重启：
$ sudo podman ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4e87c7889246 registry.redhat.io/rhel8/postgresql-10:1 run-postgresql 19 seconds ago Up 18 seconds ago 0.0.0.0:5432->5432/tcp postgresql-quay
b8fbac1920d4 registry.redhat.io/rhel8/redis-5:1 run-redis 19 seconds ago Up 18 seconds ago 0.0.0.0:6379->6379/tcp redis
d959d5bf7a24 registry.redhat.io/rhel8/postgresql-10:1 run-postgresql 18 seconds ago Up 18 seconds ago 0.0.0.0:5433->5432/tcp postgresql-clairv4
e75ff8651dbd registry.redhat.io/quay/clair-rhel8:v3.4.0 18 seconds ago Up 17 seconds ago 0.0.0.0:8081->8080/tcp clairv4
在本实例中，Quay 容器本身无法启动。这是因为，当 Quay 中启用了安全扫描时，它会尝试在启动时连接到 Clair。但是，Clair 尚未完成初始化，且无法接受连接，因此 Quay 会立即终止。若要克服此问题，您需要配置 Quay 服务，使其依赖于 Clair 的服务，如以下部分所示。
3.5.4. 配置 Quay 依赖 Clair
在 Quay 的 systemd 服务文件中，通过设置 After=container-clairv4.service 来设置 [Unit] 部分中的 Clair 服务的依赖项。若要授予 Clair 容器初始化时间，请在 [Service] 部分添加一个延迟，如 RestartSec=30。以下是在为 Clair 配置依赖关系后修改的 Quay 文件的示例：
/usr/lib/systemd/system/container-quay.service
# container-quay.service
# autogenerated by Podman 2.0.5
# Tue Feb 16 17:02:26 GMT 2021
[Unit]
Description=Podman container-quay.service
Documentation=man:podman-generate-systemd(1)
Wants=network.target
After=container-clairv4.service
[Service]
Environment=PODMAN_SYSTEMD_UNIT=%n
Restart=on-failure
RestartSec=30
ExecStartPre=/bin/rm -f %t/container-quay.pid %t/container-quay.ctr-id
ExecStart=/usr/bin/podman run --conmon-pidfile %t/container-quay.pid --cidfile %t/container-quay.ctr-id --cgroups=no-conmon -d --rm -p 8080:8080 --name=quay -v /home/user1/quay/config:/conf/stack:Z -v /home/user1/quay/storage:/datastorage:Z registry.redhat.io/quay/quay-rhel8:v3.4.0
ExecStop=/usr/bin/podman stop --ignore --cidfile %t/container-quay.ctr-id -t 10
ExecStopPost=/usr/bin/podman rm --ignore -f --cidfile %t/container-quay.ctr-id
PIDFile=%t/container-quay.pid
KillMode=none
Type=forking
[Install]
WantedBy=multi-user.target default.target
更新 Quay 服务配置后，重启服务器并立即运行 podman ps ：
$ sudo podman ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4e87c7889246 registry.redhat.io/rhel8/postgresql-10:1 run-postgresql 29 seconds ago Up 28 seconds ago 0.0.0.0:5432->5432/tcp postgresql-quay
b8fbac1920d4 registry.redhat.io/rhel8/redis-5:1 run-redis 29 seconds ago Up 28 seconds ago 0.0.0.0:6379->6379/tcp redis
d959d5bf7a24 registry.redhat.io/rhel8/postgresql-10:1 run-postgresql 28 seconds ago Up 28 seconds ago 0.0.0.0:5433->5432/tcp postgresql-clairv4
e75ff8651dbd registry.redhat.io/quay/clair-rhel8:v3.4.0 28 seconds ago Up 27 seconds ago 0.0.0.0:8081->8080/tcp clairv4
最初，Quay 容器将不可用，但当 RestartSec 延迟过期后，它应该启动：
$ sudo podman ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4e87c7889246 registry.redhat.io/rhel8/postgresql-10:1 run-postgresql 35 seconds ago Up 34 seconds ago 0.0.0.0:5432->5432/tcp postgresql-quay
ab9f0e6ad7c3 registry.redhat.io/quay/quay-rhel8:v3.4.0 registry 3 seconds ago Up 2 seconds ago 0.0.0.0:8080->8080/tcp quay
b8fbac1920d4 registry.redhat.io/rhel8/redis-5:1 run-redis 35 seconds ago Up 34 seconds ago 0.0.0.0:6379->6379/tcp redis
d959d5bf7a24 registry.redhat.io/rhel8/postgresql-10:1 run-postgresql 34 seconds ago Up 34 seconds ago 0.0.0.0:5433->5432/tcp postgresql-clairv4
e75ff8651dbd registry.redhat.io/quay/clair-rhel8:v3.4.0 34 seconds ago Up 33 seconds ago 0.0.0.0:8081->8080/tcp clairv4
Quay 容器的 CREATED 字段在创建时间时显示 30 秒差别，如服务定义中所配置。
在 quay-server.example.com 上登录到 Red Hat Quay registry，并确保一切重启。
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