Ejecutar Contenedores

Introducción

Fedora CoreOS incluye la herramienta docker de CLI (proporcionado a través de Moby) y podman instalados. Esta página explica como usar unidades systemd para iniciar y detener contenedores con podman.

Ejemplo de configuración

El siguiente fragmento de configuración de Butane configura el hello.service de systemd para ejecutar busybox.

Es posible que pueda usar referencias de archivos locales a unidades systemd en lugar de insertarlas en línea. Consulte Uso del parámetro --files-dir de butane para insertar archivos para más información.

Ejemplo de ejecución de busybox usando systemd y podman

variant: fcos
version: 1.6.0
systemd:
  units:
    - name: hello.service
      enabled: true
      contents: |
        [Unit]
        Description=MiApli
        After=network-online.target
        Wants=network-online.target

        [Service]
        TimeoutStartSec=0
        ExecStartPre=-/bin/podman kill busybox1
        ExecStartPre=-/bin/podman rm busybox1
        ExecStartPre=/bin/podman pull busybox
        ExecStart=/bin/podman run --name busybox1 busybox /bin/sh -c "trap 'exit 0' INT TERM; while true; do echo Hello World; sleep 1; done"

        [Install]
        WantedBy=multi-user.target

Example for running busybox using Podman Quadlet

Podman Quadlet is functionality included in podman that allows starting containers via systemd using a systemd generator. The example below is the same hello.service that was previously shown but deployed via the Podman Quadlet functionality.

variant: fcos
version: 1.6.0
storage:
  files:
    - path: /etc/containers/systemd/hello.container
      contents:
        inline: |
          [Unit]
          Description=Hello Service
          Wants=network-online.target
          After=network-online.target

          [Container]
          ContainerName=busybox1
          Image=docker.io/busybox
          Exec=/bin/sh -c "trap 'exit 0' INT TERM; while true; do echo Hello World; sleep 1; done"

          [Install]
          WantedBy=multi-user.target

Running etcd

etcd is not shipped as part of Fedora CoreOS. To use it, run it as a container, as shown below.

Butane config for setting up single node etcd

variant: fcos
version: 1.6.0
systemd:
  units:
    - name: etcd-member.service
      enabled: true
      contents: |
        [Unit]
        Description=Run single node etcd
        After=network-online.target
        Wants=network-online.target

        [Service]
        ExecStartPre=mkdir -p /var/lib/etcd
        ExecStartPre=-/bin/podman kill etcd
        ExecStartPre=-/bin/podman rm etcd
        ExecStartPre=-/bin/podman pull quay.io/coreos/etcd
        ExecStart=/bin/podman run --name etcd --volume /var/lib/etcd:/etcd-data:z --net=host quay.io/coreos/etcd:latest /usr/local/bin/etcd --data-dir /etcd-data --name node1 \
                --initial-advertise-peer-urls http://127.0.0.1:2380 --listen-peer-urls http://127.0.0.1:2380 \
                --advertise-client-urls http://127.0.0.1:2379 \
                --listen-client-urls http://127.0.0.1:2379 \
                --initial-cluster node1=http://127.0.0.1:2380

        ExecStop=/bin/podman stop etcd

        [Install]
        WantedBy=multi-user.target

For more information

See the etcd documentation for more information on running etcd in containers and how to set up multi-node etcd.

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