boot2docker上に各種サーバを立ち上げるシリーズ
まえがき
前回は，MacOS X + boot2dockerで共有フォルダを使えるようになりましたので，今回から各種サーバを立ち上げてみたいと思います．また，せっかくWebサーバを起動するので，WebのデータやログはMacOS X上のものを使いたいと思います．
簡単なネットワーク構成は以下のようになります．ここで，MacOS Xとboot2docker間（設定上はNAT）はVirtualBoxによるポートフォワードを，boot2dockerとnginx間はdockerによるポートフォワードをそれぞれ使います．
OS X - boot2docker( VirtualBox ) - nginx( docker )
手順1：boot2dockerの起動
まずはboot2dockerを起動します．標準のイメージではVirtualBoxの共有フォルダを使えないので，前回同様dduportal様が公開しているイメージを，Vagrantを使い起動します．
手順1
suda@sahara:~/boot2docker$ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Checking if box 'dduportal/boot2docker' is up to date...
==> default: Clearing any previously set forwarded ports...
==> default: Clearing any previously set network interfaces...
==> default: Preparing network interfaces based on configuration...
default: Adapter 1: nat
==> default: Forwarding ports...
default: 4243 => 4243 (adapter 1)
default: 22 => 2222 (adapter 1)
==> default: Running 'pre-boot' VM customizations...
==> default: Booting VM...
==> default: Waiting for machine to boot. This may take a few minutes...
default: SSH address: 127.0.0.1:2222
default: SSH username: docker
default: SSH auth method: private key
default: Warning: Connection timeout. Retrying...
==> default: Machine booted and ready!
==> default: Checking for guest additions in VM...
==> default: Mounting shared folders...
default: /vagrant => /Users/suda/boot2docker
==> default: Machine already provisioned. Run `vagrant provision` or use the `--provision`
==> default: to force provisioning. Provisioners marked to run always will still run.
suda@sahara:~/boot2docker$
手順2：VirtualBoxのポートフォワードの設定
何故かポートフォワードの設定が，boot2dockerを起動する度にクリアされるので，仕方なく毎回手動設定することにします．今回は実験のため，OS X上の8080番ポートから，boot2docker上の80番ポートにフォワードすることにします．詳しくはこちらを御覧ください．
また，仮想計算機名が長ったらしいですが，vagrantにより命名されたものです．変更しても問題無いと思います（が，何らかの不具合があっても感知しません）．
以下，設定と確認です．これによると，NIC 1のRule(1)に，今設定したポートフォワードが表示されています．
手順2
suda@sahara:~/boot2docker$ VBoxManage controlvm "boot2docker_default_1400232204582_96247" natpf1 "http,tcp,127.0.0.1,8080,,80"
suda@sahara:~/boot2docker$ VBoxManage showvminfo "boot2docker_default_1400232204582_96247" | grep "^NIC"
NIC 1: MAC: 08002793FCF5, Attachment: NAT, Cable connected: on, Trace: off (file: none), Type: 82540EM, Reported speed: 0 Mbps, Boot priority: 0, Promisc Policy: deny, Bandwidth group: none
NIC 1 Settings: MTU: 0, Socket (send: 64, receive: 64), TCP Window (send:64, receive: 64)
NIC 1 Rule(0): name = 4f9f1756-120d-4205-b097-bf0861424472, protocol = tcp, host ip = , host port = 4243, guest ip = , guest port = 4243
NIC 1 Rule(1): name = http, protocol = tcp, host ip = 127.0.0.1, host port = 8080, guest ip = , guest port = 80
NIC 1 Rule(2): name = ssh, protocol = tcp, host ip = 127.0.0.1, host port = 2222, guest ip = , guest port = 22
NIC 2: disabled
NIC 3: disabled
NIC 4: disabled
NIC 5: disabled
NIC 6: disabled
NIC 7: disabled
NIC 8: disabled
suda@sahara:~/boot2docker$
もし，httpsも追加したい場合は，続けて以下のように実行してください．この例では8443→443にポートフォワードしています．natpf1の次の項目で，ポートフォワードの名前を上記設定と別の名称にしてください．ここではhttpsにしています．
httpsも設定してみる
suda@sahara:~/boot2docker$ VBoxManage controlvm "boot2docker_default_1400232204582_96247" natpf1 "https,tcp,127.0.0.1,8443,,443"
suda@sahara:~/boot2docker$
手順3：DockerfileとDockerイメージを準備する
続いてDockerfileを作ります．今回は練習ということで，こちらを参考にしました．Ubuntuをベースにしているので，インストール作業はapt-getで済ませています．また，共有フォルダの設定として，コンテンツ，設定ファイル，ログファイルを置くディレクトリを指定しています．
~/Docker/nginx/Dockerfile
#
# Nginx
#
#
# Pull base image.
FROM ubuntu
# Install Nginx.
RUN apt-get update
RUN apt-get install -y nginx
RUN echo "\ndaemon off;" >> /etc/nginx/nginx.conf
RUN chown -R www-data:www-data /var/lib/nginx
# Define mountable directories
VOLUME [ "/usr/share/nginx/html", "/etc/nginx/sites-enabled", "/var/log/nginx" ]
# Define working directory.
WORKDIR /etc/nginx
# Define default command.
CMD [ "nginx" ]
# Expose ports.
EXPOSE 80
EXPOSE 443
ここまで来たら，Dockerイメージを作りましょう．ここで注意事項ですが，実は上記ファイルを作成した時点で「VOLUME」を「VOLUM」と恥ずかしいスペルミスしていて，以下の実行例に残っています．もう一度やり直すと，ディスク上にキャッシュされたデータが使われてしまうので，そのまま掲載します．
手順3（dockerイメージを作る)
suda@sahara:~/Docker/nginx$ docker build .
Uploading context 2.56 kB
Uploading context
Step 0 : FROM ubuntu
---> 99ec81b80c55
Step 1 : RUN apt-get update
---> Running in 7b850384dbb4
Ign http://archive.ubuntu.com trusty InRelease
Ign http://archive.ubuntu.com trusty-updates InRelease
Ign http://archive.ubuntu.com trusty-security InRelease
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Reading package lists...
---> 8baf0beb0044
Removing intermediate container 7b850384dbb4
Step 2 : RUN apt-get install -y nginx
---> Running in ccb268b16ada
Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
fontconfig-config fonts-dejavu-core geoip-database libfontconfig1
libfreetype6 libgd3 libgeoip1 libjbig0 libjpeg-turbo8 libjpeg8 libtiff5
libvpx1 libx11-6 libx11-data libxau6 libxcb1 libxdmcp6 libxml2 libxpm4
libxslt1.1 nginx-common nginx-core sgml-base xml-core
Suggested packages:
libgd-tools geoip-bin fcgiwrap nginx-doc sgml-base-doc debhelper
The following NEW packages will be installed:
fontconfig-config fonts-dejavu-core geoip-database libfontconfig1
libfreetype6 libgd3 libgeoip1 libjbig0 libjpeg-turbo8 libjpeg8 libtiff5
libvpx1 libx11-6 libx11-data libxau6 libxcb1 libxdmcp6 libxml2 libxpm4
libxslt1.1 nginx nginx-common nginx-core sgml-base xml-core
0 upgraded, 25 newly installed, 0 to remove and 10 not upgraded.
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debconf: unable to initialize frontend: Dialog
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---> 8ca9b35ead69
Removing intermediate container ccb268b16ada
Step 3 : RUN echo "\ndaemon off;" >> /etc/nginx/nginx.conf
---> Running in 0eea2056e6a5
---> b1a3804f092a
Removing intermediate container 0eea2056e6a5
Step 4 : RUN chown -R www-data:www-data /var/lib/nginx
---> Running in 465ace9e9e1c
---> fcee77b2c028
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Step 5 : VOLUM [ "/usr/share/nginx/html", "/etc/nginx/sites-enabled", "/var/log/nginx" ]
# Skipping unknown instruction VOLUM
Step 6 : WORKDIR /etc/nginx
---> Running in 7057e29b4d1e
---> ad14bb459b60
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Step 7 : CMD [ "nginx" ]
---> Running in d9e5dbd25c29
---> 53008d634493
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Step 8 : EXPOSE 80
---> Running in be51998070fa
---> e2ae6ec99d2d
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Step 9 : EXPOSE 443
---> Running in ecb7821ce31e
---> 7d7800f60c8b
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Successfully built 7d7800f60c8b
suda@sahara:~/Docker/nginx$
長いのでチェックする気も失せますが，最後の「Successfully built 7d7800f60c8b」は重要です．後々，このイメージを起動する際のキーワードになります．なお，本来はきちんと名前を付けるものです．
※以下，上記ミスを修正した状態で実行しているとお考えください．
手順4：dockerを起動してみる
はやる気持ちを抑えて，まずは共有フォルダ内にディレクトリとテスト用のHTMLファイルを置いておきます．なお，前回から引き続き，MacOS XのVagrantを起動したフォルダ（~/boot2docker）を，VirtualBoxの/vagrantにマウントしています．ですので，こちらにディレクトリとファイルを作成しておきます．
手順4：ディレクトリとテスト用のhtmlファイルを用意する
suda@sahara:~/boot2docker$ ls
Vagrantfile
suda@sahara:~/boot2docker$ mkdir www
suda@sahara:~/boot2docker$ mkdir log
suda@sahara:~/boot2docker$ ls -F
Vagrantfile log/ www/
suda@sahara:~/boot2docker$ cp ~/test.html www
ここまで来たら起動するのみです．以下の例では，コンテンツを置くディレクトリ（/usr/share/nginx/html）とログディレクトリ（/var/log/nginx）をマウントさせています．また，お試しが主目的なので「-d」オプションは付けていません．必要に応じて付けてください．
手順4の続き：Docker上でnginxを起動する
suda@sahara:~/Docker/nginx$ docker run -v /vagrant/www:/usr/share/nginx/html -v /vagrant/log:/var/log/nginx -p 80:80 7d7800f60c8b
後はMacOS X上のWebブラウザからアクセスできれば設定完了です．具体的にはhttp://localhost:8080/にアクセスしてみてください．なお，ポート番号はVirtualBoxのポートフォワードの設定により，決定されます．
このとき，nginxの仕様なのか，存在しないはずのindex.htmlにアクセスしても「Welcome to nginx!」と表示されてビックリしました．
手順5：ログファイルの確認とトラブルシューティング方法
サーバを起動したからには，きちんとログを確認しましょう．こちらもVagrantを起動したディレクトリになります．
ログの確認
suda@sahara:~/boot2docker$ cd log
suda@sahara:~/boot2docker/log$ ls -l
total 8
-rw-r--r-- 1 suda staff 802 5 19 18:54 access.log
-rw-r--r-- 1 suda staff 0 5 19 18:49 error.log
suda@sahara:~/boot2docker/log$ cat access.log
10.0.2.2 - - [19/May/2014:09:45:57 +0000] "GET / HTTP/1.1" 304 0 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.114 Safari/537.36"
10.0.2.2 - - [19/May/2014:09:46:25 +0000] "GET /index.html HTTP/1.1" 200 396 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.114 Safari/537.36"
10.0.2.2 - - [19/May/2014:09:50:26 +0000] "GET /test.html HTTP/1.1" 200 117 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.114 Safari/537.36"
suda@sahara:~/boot2docker/log$ cat error.log
suda@sahara:~/boot2docker/log$
きちんと設定が完了していれば良いのですが，うまくいかない場合は以下のようにbashを起動して原因を究明しましょう．その場合は，手順4で起動したdockerを終了させた後に，以下のようにbashを起動することになります．
経験上，Dockerを使う限り，ネットワークの設定か共有フォルダの設定が誤りやすいところです．参考までに，docker上でmountコマンドを実行すると，「none」で始まる行が存在します．これが共有フォルダ機能によってマウントされたものです．
bashを使って原因を救命する場合の実行例
suda@sahara:~/Docker/nginx$ docker run -v /vagrant/www:/usr/share/nginx/html -v /vagrant/log:/var/log/nginx -p 80:80 -t -i 7d7800f60c8b /bin/bash
root@16777ad81035:/etc/nginx# mount
none on / type aufs (rw,relatime,si=bb82befb7d80377a)
tmpfs on /dev type tmpfs (rw,nosuid,mode=755)
proc on /proc type proc (ro,relatime)
sysfs on /sys type sysfs (ro,relatime)
shm on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,size=65536k)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=666)
/dev/sda on /.dockerinit type ext4 (ro,relatime,data=ordered)
/dev/sda on /etc/resolv.conf type ext4 (ro,relatime,data=ordered)
/dev/sda on /etc/hostname type ext4 (ro,relatime,data=ordered)
/dev/sda on /etc/hosts type ext4 (ro,relatime,data=ordered)
none on /usr/share/nginx/html type vboxsf (rw,nodev,relatime)
none on /var/log/nginx type vboxsf (rw,nodev,relatime)
devpts on /dev/console type devpts (rw,relatime,mode=600,ptmxmode=000)
tmpfs on /proc/kcore type tmpfs (rw,nosuid,mode=755)
root@16777ad81035:/etc/nginx# nginx -v
nginx version: nginx/1.4.6 (Ubuntu)
root@16777ad81035:/etc/nginx#
まとめ
Dockerでbashを起動してコマンドラインに順番にコマンドを入力→終了→コンテナ化も良いのですが，せっかくDockerを使うのだから，他の人がすぐに起動できるようにDockerfileを作って公開しましょう．Dockerfileの書式が分かりづらいかもしれませんが，基本的には入力するコマンドを順に並べたものです．
と，言うわけで，順次各種サーバのDockerfileを公開していきたいと思います．