Dockerfile からの Docker イメージ作成

• 想定

  • Apache HTTP Server をインストール

• Dockerfile 作成

  FROM centos
  
  RUN yum -y update
  RUN yum -y install httpd
  

  • RUN コマンド 1 つにつき 1 つのファイルシステム層が作られる

• build

  $ docker build -t centos-apache-httpd .
  

• check images

  $ docker images
  REPOSITORY                                 TAG                 IMAGE ID            CREATED             SIZE
  centos-apache-httpd                        latest              71232abd0711        5 seconds ago       434MB
  (snip)
  

• 動作確認

  $ docker run centos-apache-httpd httpd -V
  AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 172.17.0.2. Set the 'ServerName' directive globally to suppress this message
  Server version: Apache/2.4.6 (CentOS)
  Server built:   Jun 27 2018 13:48:59
  Server's Module Magic Number: 20120211:24
  Server loaded:  APR 1.4.8, APR-UTIL 1.5.2
  Compiled using: APR 1.4.8, APR-UTIL 1.5.2
  Architecture:   64-bit
  Server MPM:     prefork
    threaded:     no
      forked:     yes (variable process count)
  Server compiled with....
   -D APR_HAS_SENDFILE
   -D APR_HAS_MMAP
   -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
   -D APR_USE_SYSVSEM_SERIALIZE
   -D APR_USE_PTHREAD_SERIALIZE
   -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
   -D APR_HAS_OTHER_CHILD
   -D AP_HAVE_RELIABLE_PIPED_LOGS
   -D DYNAMIC_MODULE_LIMIT=256
   -D HTTPD_ROOT="/etc/httpd"
   -D SUEXEC_BIN="/usr/sbin/suexec"
   -D DEFAULT_PIDLOG="/run/httpd/httpd.pid"
   -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
   -D DEFAULT_ERRORLOG="logs/error_log"
   -D AP_TYPES_CONFIG_FILE="conf/mime.types"
   -D SERVER_CONFIG_FILE="conf/httpd.conf"