centosのイメージにapache、php追加

作者:

docker と docker-compose の初歩

【入門】はじめての Docker Desktop for Mac のインストールと CentOS の仮想環境構築のセットアップ

Docker HUBから　centsos イメージをダウンロード

Docker image pull centos

centosを起動

docker container run -it -d centos
c496e4758b7355eec51e4e3fa27b5ecf597697e3296d87e7aed93663cb39cf1c

実行中のcentosにログイン

docker container ls
CONTAINER ID   IMAGE     COMMAND       CREATED         STATUS         PORTS     NAMES
a2c361e1df70   centos    "/bin/bash"   6 seconds ago   Up 5 seconds             ecstatic_kalam

docker exec -it a2c361e1df70 /bin/bash
[root@a2c361e1df70 /]#

バージョン確認

[root@a2c361e1df70 /]# cat /etc/redhat-release
CentOS Linux release 8.4.2105

apacheとphpをインストール

[root@bb6c85f446db /]# yum install httpd php -y
Failed to set locale, defaulting to C.UTF-8
CentOS Linux 8 - AppStream                                                 42  B/s |  38  B     00:00    
Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist

centos8に登録されているyumのmirrotlistには使えないサイトが含まれているので更新の必要があるらしい。（docker内でyumがつながらない時）

しかしcentos8はすでにサポートが終了しているので、centos7を使用する。

centos7のイメージをダウンロード

docke image pull centos:centos7

centosのコンテナは単純に起動しただけではsystemctl系のコマンドが使えない。

これはコンテナに全ての権限が与えられていないためらしい。（アクセスできないデバイスがあるとか）

systemctl系を使えるようにするには起動引数に「–privileged」、「/sbin/init」を追加する

例

docker container run -it -d --privileged -p 8080:80 centos:centos7 /sbin/init

centos7のコンテナではyumは期待通り動作するがsystemctlを実行すると以下のエラーが表示される。

Failed to get D-Bus connection: No such file or directory

これはMacだけの現象かも

このエラーの解消方法はDocker for mac (ver 4.3以降) で「Failed to get D-Bus connection」エラーが出たときの対処法に記載がある

~/Library/Group\ Containers/group.com.docker/settings.json
{
  // ︙
  "dataFolder": "/Users/xxx/Library/Containers/com.docker.docker/Data/vms/0/data",
  "deprecatedCgroupv1": false,             // ← こちらを true へ
  "disableHardwareAcceleration": false,
  "disableTips": true,
  // ︙

settings.json編集後、Macを再起動。

これでDockerコンテナ上のcentos7でsystemctlが使えるようになる。

コンテナを起動後、コンテナにログイン

docker container run -it -d --privileged -p 8080:80 centos:centos7 /sbin/init

docker ps -a                       
CONTAINER ID   IMAGE            COMMAND        CREATED          STATUS          PORTS                  NAMES
75ffbe714b9e   centos:centos7   "/sbin/init"   48 seconds ago   Up 47 seconds   0.0.0.0:8080->80/tcp   strange_benz

docker exec -it 75ffbe714b9e  /bin/bash

Apache、phpをインストール

yum install httpd php -y

Loaded plugins: fastestmirror, ovl
Determining fastest mirrors
 * base: ftp.nara.wide.ad.jp
 * extras: ftp.nara.wide.ad.jp
 * updates: ftp.nara.wide.ad.jp
base                                                                             | 3.6 kB  00:00:00     
extras                                                                           | 2.9 kB  00:00:00     
updates                                                                          | 2.9 kB  00:00:00     
(1/4): base/7/x86_64/group_gz                                                    | 153 kB  00:00:00     
(2/4): extras/7/x86_64/primary_db                                                | 250 kB  00:00:00     
(3/4): base/7/x86_64/primary_db                                                  | 6.1 MB  00:00:01     
(4/4): updates/7/x86_64/primary_db                                               |  22 MB  00:00:03     
Resolving Dependencies
--> Running transaction check
---> Package httpd.x86_64 0:2.4.6-99.el7.centos.1 will be installed
--> Processing Dependency: httpd-tools = 2.4.6-99.el7.centos.1 for package: httpd-2.4.6-99.el7.centos.1.x86_64
--> Processing Dependency: system-logos >= 7.92.1-1 for package: httpd-2.4.6-99.el7.centos.1.x86_64
--> Processing Dependency: /etc/mime.types for package: httpd-2.4.6-99.el7.centos.1.x86_64
--> Processing Dependency: libaprutil-1.so.0()(64bit) for package: httpd-2.4.6-99.el7.centos.1.x86_64
--> Processing Dependency: libapr-1.so.0()(64bit) for package: httpd-2.4.6-99.el7.centos.1.x86_64
---> Package php.x86_64 0:5.4.16-48.el7 will be installed
--> Processing Dependency: php-common(x86-64) = 5.4.16-48.el7 for package: php-5.4.16-48.el7.x86_64
--> Processing Dependency: php-cli(x86-64) = 5.4.16-48.el7 for package: php-5.4.16-48.el7.x86_64
--> Running transaction check
---> Package apr.x86_64 0:1.4.8-7.el7 will be installed
---> Package apr-util.x86_64 0:1.5.2-6.el7_9.1 will be installed
---> Package centos-logos.noarch 0:70.0.6-3.el7.centos will be installed
---> Package httpd-tools.x86_64 0:2.4.6-99.el7.centos.1 will be installed
---> Package mailcap.noarch 0:2.1.41-2.el7 will be installed
---> Package php-cli.x86_64 0:5.4.16-48.el7 will be installed
--> Processing Dependency: libedit.so.0()(64bit) for package: php-cli-5.4.16-48.el7.x86_64
---> Package php-common.x86_64 0:5.4.16-48.el7 will be installed
--> Processing Dependency: libzip.so.2()(64bit) for package: php-common-5.4.16-48.el7.x86_64
--> Running transaction check
---> Package libedit.x86_64 0:3.0-12.20121213cvs.el7 will be installed
---> Package libzip.x86_64 0:0.10.1-8.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

========================================================================================================
 Package                 Arch              Version                             Repository          Size
========================================================================================================
Installing:
 httpd                   x86_64            2.4.6-99.el7.centos.1               updates            2.7 M
 php                     x86_64            5.4.16-48.el7                       base               1.4 M
Installing for dependencies:
 apr                     x86_64            1.4.8-7.el7                         base               104 k
 apr-util                x86_64            1.5.2-6.el7_9.1                     updates             92 k
 centos-logos            noarch            70.0.6-3.el7.centos                 base                21 M
 httpd-tools             x86_64            2.4.6-99.el7.centos.1               updates             94 k
 libedit                 x86_64            3.0-12.20121213cvs.el7              base                92 k
 libzip                  x86_64            0.10.1-8.el7                        base                48 k
 mailcap                 noarch            2.1.41-2.el7                        base                31 k
 php-cli                 x86_64            5.4.16-48.el7                       base               2.7 M
 php-common              x86_64            5.4.16-48.el7                       base               565 k

Transaction Summary
========================================================================================================
Install  2 Packages (+9 Dependent packages)

Total download size: 29 M
Installed size: 49 M
Downloading packages:
warning: /var/cache/yum/x86_64/7/updates/packages/apr-util-1.5.2-6.el7_9.1.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
Public key for apr-util-1.5.2-6.el7_9.1.x86_64.rpm is not installed
(1/11): apr-util-1.5.2-6.el7_9.1.x86_64.rpm                                      |  92 kB  00:00:00     
Public key for apr-1.4.8-7.el7.x86_64.rpm is not installed
(2/11): apr-1.4.8-7.el7.x86_64.rpm                                               | 104 kB  00:00:00     
(3/11): libedit-3.0-12.20121213cvs.el7.x86_64.rpm                                |  92 kB  00:00:00     
(4/11): libzip-0.10.1-8.el7.x86_64.rpm                                           |  48 kB  00:00:00     
(5/11): mailcap-2.1.41-2.el7.noarch.rpm                                          |  31 kB  00:00:00     
(6/11): httpd-tools-2.4.6-99.el7.centos.1.x86_64.rpm                             |  94 kB  00:00:00     
(7/11): php-5.4.16-48.el7.x86_64.rpm                                             | 1.4 MB  00:00:00     
(8/11): php-common-5.4.16-48.el7.x86_64.rpm                                      | 565 kB  00:00:00     
(9/11): php-cli-5.4.16-48.el7.x86_64.rpm                                         | 2.7 MB  00:00:00     
(10/11): httpd-2.4.6-99.el7.centos.1.x86_64.rpm                                  | 2.7 MB  00:00:00     
(11/11): centos-logos-70.0.6-3.el7.centos.noarch.rpm                             |  21 MB  00:00:02     
--------------------------------------------------------------------------------------------------------
Total                                                                    13 MB/s |  29 MB  00:00:02     
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Importing GPG key 0xF4A80EB5:
 Userid     : "CentOS-7 Key (CentOS 7 Official Signing Key) "
 Fingerprint: 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5
 Package    : centos-release-7-9.2009.0.el7.centos.x86_64 (@CentOS)
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : apr-1.4.8-7.el7.x86_64                                                              1/11 
  Installing : apr-util-1.5.2-6.el7_9.1.x86_64                                                     2/11 
  Installing : httpd-tools-2.4.6-99.el7.centos.1.x86_64                                            3/11 
  Installing : centos-logos-70.0.6-3.el7.centos.noarch                                             4/11 
  Installing : libzip-0.10.1-8.el7.x86_64                                                          5/11 
  Installing : php-common-5.4.16-48.el7.x86_64                                                     6/11 
  Installing : libedit-3.0-12.20121213cvs.el7.x86_64                                               7/11 
  Installing : php-cli-5.4.16-48.el7.x86_64                                                        8/11 
  Installing : mailcap-2.1.41-2.el7.noarch                                                         9/11 
  Installing : httpd-2.4.6-99.el7.centos.1.x86_64                                                 10/11 
  Installing : php-5.4.16-48.el7.x86_64                                                           11/11 
  Verifying  : httpd-tools-2.4.6-99.el7.centos.1.x86_64                                            1/11 
  Verifying  : mailcap-2.1.41-2.el7.noarch                                                         2/11 
  Verifying  : apr-1.4.8-7.el7.x86_64                                                              3/11 
  Verifying  : libedit-3.0-12.20121213cvs.el7.x86_64                                               4/11 
  Verifying  : php-cli-5.4.16-48.el7.x86_64                                                        5/11 
  Verifying  : httpd-2.4.6-99.el7.centos.1.x86_64                                                  6/11 
  Verifying  : libzip-0.10.1-8.el7.x86_64                                                          7/11 
  Verifying  : php-common-5.4.16-48.el7.x86_64                                                     8/11 
  Verifying  : php-5.4.16-48.el7.x86_64                                                            9/11 
  Verifying  : apr-util-1.5.2-6.el7_9.1.x86_64                                                    10/11 
  Verifying  : centos-logos-70.0.6-3.el7.centos.noarch                                            11/11 

Installed:
  httpd.x86_64 0:2.4.6-99.el7.centos.1                    php.x86_64 0:5.4.16-48.el7                   

Dependency Installed:
  apr.x86_64 0:1.4.8-7.el7                           apr-util.x86_64 0:1.5.2-6.el7_9.1                  
  centos-logos.noarch 0:70.0.6-3.el7.centos          httpd-tools.x86_64 0:2.4.6-99.el7.centos.1         
  libedit.x86_64 0:3.0-12.20121213cvs.el7            libzip.x86_64 0:0.10.1-8.el7                       
  mailcap.noarch 0:2.1.41-2.el7                      php-cli.x86_64 0:5.4.16-48.el7                     
  php-common.x86_64 0:5.4.16-48.el7                 
Complete!

Apacheのインストールを確認後、起動、phpのバージョン確認

ps -ax
  PID TTY      STAT   TIME COMMAND
    1 ?        Ss     0:00 /sbin/init
   17 ?        Ss     0:00 /usr/lib/systemd/systemd-journald
   31 ?        Ss     0:00 /usr/lib/systemd/systemd-udevd
   53 ?        Ss     0:00 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --syste
   61 ?        Ss     0:00 /usr/lib/systemd/systemd-logind
   62 tty1     Ss+    0:00 /sbin/agetty --noclear tty1 linux
   64 pts/1    Ss     0:00 /bin/bash
  160 pts/1    R+     0:00 ps -ax

systemctl start httpd

php -v  
PHP 5.4.16 (cli) (built: Apr  1 2020 04:07:17) 
Copyright (c) 1997-2013 The PHP Group

/var/www/html/index.phpを作成してブラウザで表示

Apacheを自動起動設定後、イメージを保存

systemctl enable httpd
exit

docker container stop 2336ba31d7b4
docker commit 2336ba31d7b4 centos:centos7_httpd_php