Nginx/React/Express/MongoDB on Docker の構築 その1 MongoDB

インフラエンジニアとして、上で動くアプリケーションの勉強のため
表題の構成を作る。

まずは、MongoDBをDockerで建てるところから。

MongoDB

もともとDoubleClick社で開発されていたデータベースで所謂NoSQLと呼ばれるもの。
オープンソースで、Failoverもサポートされていて、分散データベースのためスケールアウトもするとのこと。
ここからダウンロード可能。
https://github.com/mongodb/mongo

CentOSベースのDockerを動かす

CentOSベースのイメージをダウンロード

$ docker pull centos:latest
Trying to pull repository docker.io/library/centos ...
latest: Pulling from docker.io/library/centos
af4b0a2388c6: Pull complete
Digest: sha256:2671f7a3eea36ce43609e9fe7435ade83094291055f1c96d9d1d1d7c0b986a5d

イメージの確認

$ docker images centos:latest
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
docker.io/centos    latest              ff426288ea90        7 weeks ago         207.2 MB

CentOSのdockerをデーモンとして動作させる
systemctlを使いたいので、--priviledgedを指定。

$ docker run -itd --privileged --name mongodb centos:latest /sbin/init
72059102d58eb931b92ee1d32b55c759e7e5a46153e99607495756ca47bf6d2a

CentOSのdockerに接続

$ docker exec -it mongodb /bin/bash
[root@72059102d58e /]#

YumからMongodbのインストール

ここを参考に
最後にsystemctl status mongodで状態確認。

[root@72059102d58e /]# touch /etc/yum.repos.d/mongodb-org-3.6.repo
[root@72059102d58e /]# echo '[mongodb-org-3.6]' >> /etc/yum.repos.d/mongodb-org-3.6.repo
[root@72059102d58e /]# echo 'name=MongoDB Repository' >> /etc/yum.repos.d/mongodb-org-3.6.repo
[root@72059102d58e /]# echo 'baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.6/x86_64/' >> /etc/yum.repos.d/mongodb-org-3.6.repo
[root@72059102d58e /]# echo 'gpgcheck=1' >> /etc/yum.repos.d/mongodb-org-3.6.repo
[root@72059102d58e /]# echo 'enabled=1' >> /etc/yum.repos.d/mongodb-org-3.6.repo
[root@72059102d58e /]# echo 'gpgkey=https://www.mongodb.org/static/pgp/server-3.6.asc' >> /etc/yum.repos.d/mongodb-org-3.6.repo
[root@72059102d58e /]# yum install -y mongodb-org
<snip>
[root@72059102d58e /]# systemctl enable mongod
[root@72059102d58e /]# systemctl start mongod
[root@72059102d58e /]# systemctl status mongod
● mongod.service - High-performance, schema-free document-oriented database
   Loaded: loaded (/usr/lib/systemd/system/mongod.service; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2018-02-27 01:36:23 UTC; 2s ago
     Docs: https://docs.mongodb.org/manual
  Process: 171 ExecStart=/usr/bin/mongod $OPTIONS (code=exited, status=0/SUCCESS)
  Process: 170 ExecStartPre=/usr/bin/chmod 0755 /var/run/mongodb (code=exited, status=0/SUCCESS)
  Process: 169 ExecStartPre=/usr/bin/chown mongod:mongod /var/run/mongodb (code=exited, status=0/SUCCESS)
  Process: 168 ExecStartPre=/usr/bin/mkdir -p /var/run/mongodb (code=exited, status=0/SUCCESS)
 Main PID: 173 (mongod)
   CGroup: /system.slice/docker-72059102d58eb931b92ee1d32b55c759e7e5a46153e99607495756ca47bf6d2a.scope/system.slice/mongod.service
           └─173 /usr/bin/mongod -f /etc/mongod.conf

Feb 27 01:36:22 72059102d58e systemd[1]: Starting High-performance, schema-free document-oriented database...
Feb 27 01:36:22 72059102d58e mongod[171]: about to fork child process, waiting until server is ready for connections.
Feb 27 01:36:22 72059102d58e mongod[171]: forked process: 173
Feb 27 01:36:23 72059102d58e systemd[1]: Started High-performance, schema-free document-oriented database.
[root@72059102d58e /]# 

DBに接続してみる

[root@72059102d58e /]# mongo --host 127.0.0.1:27017
MongoDB shell version v3.6.3
connecting to: mongodb://127.0.0.1:27017/
MongoDB server version: 3.6.3
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
    http://docs.mongodb.org/
Questions? Try the support group
    http://groups.google.com/group/mongodb-user
Server has startup warnings:
2018-02-27T01:36:23.109+0000 I CONTROL  [initandlisten]
2018-02-27T01:36:23.109+0000 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2018-02-27T01:36:23.109+0000 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2018-02-27T01:36:23.109+0000 I CONTROL  [initandlisten]
2018-02-27T01:36:23.109+0000 I CONTROL  [initandlisten]
2018-02-27T01:36:23.109+0000 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2018-02-27T01:36:23.109+0000 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2018-02-27T01:36:23.109+0000 I CONTROL  [initandlisten]
2018-02-27T01:36:23.109+0000 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2018-02-27T01:36:23.109+0000 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2018-02-27T01:36:23.109+0000 I CONTROL  [initandlisten]
> show dbs
admin  0.000GB
local  0.000GB
> exit
bye

もうこのdockerはいらないので削除

$ docker kill mongodb
$ docker rm mongodb

Dockerfileを作成して、イメージをBuild

接続できたので、これらをdockerのイメージとしてBuildする

Dockerfileは以下の通り

FROM centos:7
MAINTAINER "yuki"

RUN yum update -y && yum clean all
RUN touch /etc/yum.repos.d/mongodb-org-3.6.repo
RUN echo '[mongodb-org-3.6]' >> /etc/yum.repos.d/mongodb-org-3.6.repo
RUN echo 'name=MongoDB Repository' >> /etc/yum.repos.d/mongodb-org-3.6.repo
RUN echo 'baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.6/x86_64/' >> /etc/yum.repos.d/mongodb-org-3.6.repo
RUN echo 'gpgcheck=1' >> /etc/yum.repos.d/mongodb-org-3.6.repo
RUN echo 'enabled=1' >> /etc/yum.repos.d/mongodb-org-3.6.repo
RUN echo 'gpgkey=https://www.mongodb.org/static/pgp/server-3.6.asc' >> /etc/yum.repos.d/mongodb-org-3.6.repo
RUN yum install -y mongodb-org && yum clean all

# Enable Mongodb
RUN systemctl enable mongod

# Start init daemon
CMD ["/sbin/init"]

イメージをbuild

$ docker build -t ytsuboi/mongodb:1.0 .
Sending build context to Docker daemon  2.56 kB
Step 1 : FROM centos:7
 ---> ff426288ea90
Step 2 : MAINTAINER "ytsuboi"
 ---> Running in e29fc4bca889
 ---> 223b3391b4ee
Removing intermediate container e29fc4bca889
Step 3 : RUN yum update -y && yum clean all
 ---> Running in 5bd346e13c71
Loaded plugins: fastestmirror, ovl
Determining fastest mirrors
 * base: ftp.riken.jp
 * extras: ftp.riken.jp
 * updates: ftp.riken.jp
<snip>
Removing intermediate container da4c2a49ab06
Successfully built 42a0b42361fd
$ docker images ytsuboi/mongodb:1.0
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
ytsuboi/mongodb     1.0                 42a0b42361fd        8 minutes ago       575.8 MB

試しにDockerを起動してみる

$ docker run -itd --privileged --name mongodb ytsuboi/mongodb:1.0 /sbin/init
69eacc89ba04324c1b679a724a478c31839355b5b29c15365be2c036fb536b1c
$ docker ps
CONTAINER ID        IMAGE                 COMMAND             CREATED             STATUS              PORTS               NAMES
69eacc89ba04        ytsuboi/mongodb:1.0   "/sbin/init"        8 seconds ago       Up 8 seconds                            mongodb
$ docker exec -it mongodb /bin/bash
[root@69eacc89ba04 /]#
[root@69eacc89ba04 /]# mongo --host 127.0.0.1:27017
MongoDB shell version v3.6.3
connecting to: mongodb://127.0.0.1:27017/
MongoDB server version: 3.6.3
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
    http://docs.mongodb.org/
Questions? Try the support group
    http://groups.google.com/group/mongodb-user
Server has startup warnings:
2018-02-27T01:43:04.432+0000 I CONTROL  [initandlisten]
2018-02-27T01:43:04.432+0000 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2018-02-27T01:43:04.432+0000 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2018-02-27T01:43:04.432+0000 I CONTROL  [initandlisten]
2018-02-27T01:43:04.432+0000 I CONTROL  [initandlisten]
2018-02-27T01:43:04.432+0000 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2018-02-27T01:43:04.432+0000 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2018-02-27T01:43:04.432+0000 I CONTROL  [initandlisten]
2018-02-27T01:43:04.432+0000 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2018-02-27T01:43:04.432+0000 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2018-02-27T01:43:04.432+0000 I CONTROL  [initandlisten]
>
bye
[root@69eacc89ba04 /]#

おわり

これでMongodbのdockerでの構築終了。
次は、Node.jsあたりからこのDBを操作するあたりを

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