起動～

●サービス開始

[root@rh74 ~]# systemctl start docker.service

●サービス状態確認

[root@rh74 ~]# systemctl status docker.service

● docker.service - Docker Application Container Engine

Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)

Active: active (running) since 月 2019-10-21 00:16:32 JST; 19s ago

Docs: http://docs.docker.com

Main PID: 4490 (dockerd-current)

CGroup: /system.slice/docker.service

tq4490 /usr/bin/dockerd-current --add-runtime docker-runc=/usr/libexec...

mq4497 /usr/bin/docker-containerd-current -l unix:///var/run/docker/li...

10月 21 00:16:30 rh74 dockerd-current[4490]: time="2019-10-21T00:16:30.98546113..."

10月 21 00:16:32 rh74 dockerd-current[4490]: time="2019-10-21T00:16:32.36825775..."

10月 21 00:16:32 rh74 dockerd-current[4490]: time="2019-10-21T00:16:32.36933005..."

10月 21 00:16:32 rh74 dockerd-current[4490]: time="2019-10-21T00:16:32.40720094..."

10月 21 00:16:32 rh74 dockerd-current[4490]: time="2019-10-21T00:16:32.66237838..."

10月 21 00:16:32 rh74 dockerd-current[4490]: time="2019-10-21T00:16:32.87764151..."

10月 21 00:16:32 rh74 dockerd-current[4490]: time="2019-10-21T00:16:32.95384278..."

10月 21 00:16:32 rh74 dockerd-current[4490]: time="2019-10-21T00:16:32.95407665...1

10月 21 00:16:32 rh74 systemd[1]: Started Docker Application Container Engine.

10月 21 00:16:32 rh74 dockerd-current[4490]: time="2019-10-21T00:16:32.97417491..."

Hint: Some lines were ellipsized, use -l to show in full.

[root@rh74 ~]# docker info

Containers: 0

Running: 0

Paused: 0

Stopped: 0

Images: 0

Server Version: 1.13.1

Storage Driver: overlay2

Backing Filesystem: xfs

Supports d_type: true

Native Overlay Diff: true

Logging Driver: journald

Cgroup Driver: systemd

Plugins:

Volume: local

Network: bridge host macvlan null overlay

Authorization: rhel-push-plugin

Swarm: inactive

Runtimes: docker-runc runc

Default Runtime: docker-runc

Init Binary: /usr/libexec/docker/docker-init-current

containerd version: (expected: aa8187dbd3b7ad67d8e5e3a15115d3eef43a7ed1)

runc version: 9c3c5f853ebf0ffac0d087e94daef462133b69c7 (expected: 9df8b306d01f59d3a8029be411de015b7304dd8f)

init version: fec3683b971d9c3ef73f284f176672c44b448662 (expected: 949e6facb77383876aeff8a6944dde66b3089574)

Security Options:

seccomp

WARNING: You're not using the default seccomp profile

Profile: /etc/docker/seccomp.json

selinux

Kernel Version: 3.10.0-693.el7.x86_64

Operating System: Red Hat Enterprise Linux

OSType: linux

Architecture: x86_64

Number of Docker Hooks: 3

CPUs: 1

Total Memory: 992.4 MiB

Name: rh74

ID: IM7R:MBY4:LTZ4:HHHR:S4SZ:RAYO:YJZS:TSLG:FMK4:ER5C:55QX:7O7L

Docker Root Dir: /var/lib/docker

Debug Mode (client): false

Debug Mode (server): false

Registry: https://registry.access.redhat.com/v1/

Experimental: false

Insecure Registries:

127.0.0.0/8

Live Restore Enabled: false

Registries: registry.access.redhat.com (secure), docker.io (secure), registry.fedoraproject.org (secure), quay.io (secure), registry.centos.org (secure), docker.io (secure)

●Docker公式レジストリからイメージを検索する

[root@rh74 ~]# docker search centos

INDEX NAME DESCRIPTION STARS OFFICIAL AUTOMATED

docker.io docker.io/centos The official build of CentOS. 5616 [OK]

docker.io docker.io/ansible/centos7-ansible Ansible on Centos7 124 [OK]

docker.io docker.io/jdeathe/centos-ssh OpenSSH / Supervisor / EPEL/IUS/SCL Repos ... 114 [OK]

docker.io docker.io/consol/centos-xfce-vnc Centos container with "headless" VNC sessi... 99 [OK]

[root@rh74 ~]# docker search vsftpd

INDEX NAME DESCRIPTION STARS OFFICIAL AUTOMATED

docker.io docker.io/fauria/vsftpd vsftpd Docker image based on Centos 7. Sup... 76 [OK]

docker.io docker.io/panubo/vsftpd vsftpd - Secure, fast FTP server 23 [OK]

●ダウンロード

[root@rh74 ~]# docker pull centos

Using default tag: latest

Trying to pull repository registry.access.redhat.com/centos ...

Pulling repository registry.access.redhat.com/centos

Trying to pull repository docker.io/library/centos ...

latest: Pulling from docker.io/library/centos

729ec3a6ada3: Pull complete

Digest: sha256:f94c1d992c193b3dc09e297ffd54d8a4f1dc946c37cbeceb26d35ce1647f88d9

Status: Downloaded newer image for docker.io/centos:latest

[root@rh74 ~]# docker pull docker.io/fauria/vsftpd

Using default tag: latest

Trying to pull repository docker.io/fauria/vsftpd ...

latest: Pulling from docker.io/fauria/vsftpd

d8d02d457314: Pull complete

1b736e561fc2: Pull complete

3fc2d5ca0818: Pull complete

d1a79586d7a2: Pull complete

df260f25215a: Pull complete

0c8b59e58472: Pull complete

2e51b576696b: Pull complete

45830c2b6b6e: Pull complete

0d1d2099cdc9: Pull complete

b45e9cd1507e: Pull complete

Digest: sha256:5cd0cd3d674f6ec7668f24e4c0e6d56ce07afe050ea007b1b55077a29e16aca8

Status: Downloaded newer image for docker.io/fauria/vsftpd:latest

[root@rh74 ~]# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

docker.io/fauria/vsftpd latest 2497f179cf1d 5 days ago 391 MB

docker.io/centos latest 0f3e07c0138f 2 weeks ago 220 MB

●dockerコンテナ作成

[root@rh74 ~]# docker run -it centos:latest /bin/bash

※イメージ「centos:latest」を「-it（コンテナとホストの入出力をつなげる）」オプションで起動し、「/bin/bash」を実行するという意味かな？

※最後の/bin/bashは無くても同じ動きだった。

[root@94c21fb5273b /]# cat /etc/centos-release

CentOS Linux release 8.0.1905 (Core)

※CentOSのバージョンが見れる

[root@94c21fb5273b /]# uname -n

94c21fb5273b

[root@94c21fb5273b /]# uname -a

Linux 94c21fb5273b 3.10.0-693.el7.x86_64 #1 SMP Thu Jul 6 19:56:57 EDT 2017 x86_64 x86_64 x86_64 GNU/Linux

※カーネルはホストと同じバージョンが表示される

[root@94c21fb5273b /]# df -h

Filesystem Size Used Avail Use% Mounted on

overlay 2.0G 1.2G 811M 61% /

tmpfs 497M 0 497M 0% /dev

tmpfs 497M 0 497M 0% /sys/fs/cgroup

/dev/sda5 2.0G 1.2G 811M 61% /etc/hosts

shm 64M 0 64M 0% /dev/shm

tmpfs 497M 0 497M 0% /proc/acpi

tmpfs 497M 0 497M 0% /proc/scsi

tmpfs 497M 0 497M 0% /sys/firmware

[root@94c21fb5273b /]# ps -elf

F S UID PID PPID C PRI NI ADDR SZ WCHAN STIME TTY TIME CMD

4 S root 1 0 0 80 0 - 3004 do_wai 15:46 ? 00:00:00 /bin/bash

0 R root 18 1 0 80 0 - 10984 - 15:57 ? 00:00:00 ps -elf

●dockerの外から見ると

[root@rh74 ~]# docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

94c21fb5273b centos:latest "/bin/bash" 11 minutes ago Up 11 minutes festive_clarke

[root@rh74 ~]# df -h

ファイルシスサイズ使用残り使用% マウント位置

/dev/sda2 5.0G 87M 5.0G 2% /

devtmpfs 483M 0 483M 0% /dev

tmpfs 497M 0 497M 0% /dev/shm

tmpfs 497M 7.2M 490M 2% /run

tmpfs 497M 0 497M 0% /sys/fs/cgroup

/dev/sda3 5.0G 3.4G 1.7G 67% /usr

/dev/sda5 2.0G 1.2G 811M 61% /var

/dev/mapper/vg01-lv01 1017M 141M 877M 14% /bk

/dev/sda6 2.0G 33M 2.0G 2% /tmp

/dev/sda1 1014M 158M 857M 16% /boot

/dev/sda7 2.0G 33M 2.0G 2% /home

tmpfs 100M 8.0K 100M 1% /run/user/0

/dev/sr0 3.8G 3.8G 0 100% /media

tmpfs 100M 12K 100M 1% /run/user/42

overlay 2.0G 1.2G 811M 61% /var/lib/docker/overlay2/b53ebe54a580a515434481e174c2bc54826c96dec322f7672c4b246e220f73e6/merged

shm 64M 0 64M 0% /var/lib/docker/containers/94c21fb5273bda1f248090568990ba153dce952a8ee3a51a7c0e7e6751cf1762/shm

[root@rh74 ~]# docker ps -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

94c21fb5273b centos:latest "/bin/bash" 14 minutes ago Up 14 minutes festive_clarke

5ff06a527897 centos:latest "/bin/bash" 14 minutes ago Exited (0) 14 minutes ago thirsty_hodgkin

※起動していないコンテナも表示される

[root@rh74 ~]# docker rm 5ff06a527897

5ff06a527897

※コンテナの削除

[root@rh74 ~]# docker ps -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

94c21fb5273b centos:latest "/bin/bash" 20 minutes ago Up 20 minutes festive_clarke

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