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DBMS single init

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[![logo](https://www.hongsnet.net/images/logo.gif)](https://www.hongsnet.net)
# MariaDB의 Dockerize 구성
> 기존 KVM 가상머신 기반의 DBMS를 Docker 기반으로 변경하여 운용한다. 단, Back-End 시스템만 컨테이너 오케스트레이션 구성을 적용하고, DBMS는 단독 Docker 기반으로 구성한다.
# Docker 이미지 Build
* [ ] Dockerfile을 이용한 Image Build
* [ ] Build된 이미지의 Container Registry 등록
* [ ] docker-compose를 이용한 컨테이너 실행
* [ ] Portainer를 이용한 관리
## Dockerfile을 이용한 Image Build
```bash
# cat Dockerfile
FROM registry.hongsnet.net/joohan.hong/docker/centos:7.6.1810
MAINTAINER Hongs <master@hongsnet.net>
#TIME ZONE 설정
ENV TZ=Asia/Seoul
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone &&\
yum -y install epel-release
#한글 지원
ENV LANG en_US.UTF-8
ENV LC_ALL en_US.UTF-8
COPY CONFIG/MariaDB.repo /etc/yum.repos.d/MariaDB.repo
COPY CONFIG/bashrc /root/.bashrc
COPY CONFIG/my.cnf /etc/my.cnf
#RUN yum update
RUN yum -y install glibc glibc-common openssl-devel net-tools vi vim iproute wget bind-utils pwgen psmisc hostname openssh-server openssh-clients MariaDB MariaDB-server MariaDB-client MariaDB-backup cronie crontabs supervisor
RUN ln -s /usr/bin/resolveip /usr/libexec/resolveip
COPY CONFIG/supervisord.conf /etc/supervisor/supervisord.conf
COPY CONFIG/mysql.conf /etc/supervisor/conf.d/mysql.conf
COPY CONFIG/mariadb_start.sh /
RUN chmod 700 /mariadb_start.sh
RUN chown mysql.mysql /mariadb_start.sh
EXPOSE 3306
CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/supervisord.conf"]
```
## DBMS Docker Image 적용 내역
- CentOS 7
- MariaDB 10.3
- supervisord
## MariaDB 10.3 설정 내역
CentOS 7 YUM 내부 Repository
```bash
# cat CONFIG/MariaDB.repo
[mariadb]
name = MariaDB
baseurl = http://yum.hongsnet.net:8889/mariadb/centos7/10.3/$basearch
gpgcheck=0
```
my.cnf 설정내역은 다음과 같다.
```bash
# cat CONFIG/my.cnf
#
[client]
port = 3306
socket = /var/lib/mysql/mysql.sock
[mysqld_safe]
socket = /var/lib/mysql/mysql.sock
nice = 0
[mysqld]
log-error = /var/lib/mysql/mysql.err
init_connect='SET collation_connection = utf8_unicode_ci'
init_connect='SET NAMES utf8'
character-set-server=utf8
collation-server=utf8_unicode_ci
skip-character-set-client-handshake
default-storage-engine=InnoDB
max_allowed_packet = 1024M
net_read_timeout=120
net_write_timeout=120
#wait_timeout=86400
wait_timeout=30
user = mysql
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
skip-external-locking
skip-name-resolve
key_buffer_size = 64M
max_allowed_packet = 1024M
thread_stack = 192K
thread_cache_size = 256
max_connections = 4096
table_cache = 1024
tmp_table_size = 32M
max_heap_table_size = 32M
query_cache_size = 128M
query_cache_type = 1
sort_buffer_size = 256K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
long_query_time = 2
server-id = 250
log_bin = mysql-bin
expire_logs_days = 3
max_binlog_size = 1024M
innodb_buffer_pool_size = 4096M
innodb_flush_log_at_trx_commit = 0
innodb_lock_wait_timeout = 50
innodb_thread_concurrency = 8
innodb_log_buffer_size = 8M
innodb_log_file_size = 64M
innodb_log_files_in_group = 2
innodb_file_per_table=1
[mysqldump]
quick
quote-names
max_allowed_packet = 1024M
[mysql]
max_allowed_packet = 1024M
[isamchk]
key_buffer_size = 16M
[client-server]
```
MariaDB의 Supervisord 설정은 다음과 같다.
```bash
# cat CONFIG/mysql.conf
[program:nginx]
command=/mariadb_start.sh
user=mysql
[program:crond]
command=/usr/sbin/crond -n
user=root
```
MariaDB의 시작 스크립트는 다음과 같다.
```bash
# cat CONFIG/mariadb_start.sh
#!/bin/bash
MYSQL_ROOT_PASSWORD="패스워드"
if [ ! -d /var/lib/mysql/mysql ]; then
echo -ne "Populating DataDir ... "
mysql_install_db --user=mysql
echo "Done"
fi
if [ ! -f /etc/my.cnf ]; then
echo -ne "Populating ConfDir ... "
cp /my.cnf /etc/my.cnf
chown -R mysql:mysql /etc/my.cnf
echo "Done"
fi
if [[ -z ${MYSQL_ROOT_PASSWORD} ]]; then
MYSQL_ROOT_PASSWORD=$(pwgen -s -1 12)
echo "Your Root password is : ${MYSQL_ROOT_PASSWORD}"
fi
chown mysql.mysql /etc/my.cnf
chown -R mysql.mysql /var/lib/mysql
echo "Starintg MariaDB ..."
tail -f /var/lib/mysql/mysql.err &
/usr/bin/mysqld_safe
```
> 이 스크립트는 MaraiDB 기동 시 권한을 조정한 후 실행하는 것이 핵심인 init 스크립트 이다.
## Docker Image Build 및 Container Registry Push
```bash
# docker build --rm -t centos7.6-mariadb10.3 .
```
위와 같이 Build가 수행한 후 정상적으로 완료되면, 다음과 같이 Docker Image가 생성된다.
```bash
# docker images |grep centos7.6-mariadb
centos7.6-mariadb10.3 latest 408af11faf06 6 weeks ago 956MB
```
내부 Container Registry는 GitLAB에서 제공하는 기능을 사용한다. 다음과 같이 스크립트를 작성하여, PUSH 한다.
```bash
# cat docker-image-push.sh
#!/bin/bash
DATE="20201016"
docker login -u juhanida21@nate.com -p PRIVATE_KEY registry.hongsnet.net
/usr/bin/docker tag centos7.6-mariadb10.3:latest registry.hongsnet.net/joohan.hong/docker/mariadb:centos7-10.3_$DATE
/usr/bin/docker push registry.hongsnet.net/joohan.hong/docker/mariadb:centos7-10.3_$DATE
if [[ `docker images -f "dangling=true" -q` != "" ]]; then
docker rmi $(docker images -f "dangling=true" -q);
fi
```
!참고 : 최종적으로 PUSH 되는 Image의 TAG는 `$DATE` -> YYYYMMDD 이다.
## docker-compose를 이용한 컨테이너 실행
```python
# cat docker-compose.yml
version: '3'
services:
centos76-mariadb103:
image: registry.hongsnet.net/joohan.hong/docker/mariadb:centos7-10.3_20210116
#image: centos7.6-mariadb10.3-hongsnet
restart: always
hostname: 'centos7-mariadb103'
container_name: centos7.6-mariadb10.3
environment:
- MYSQL_ROOT_PASSWORD=패스워드
volumes:
- "/var/lib/libvirt/MYSQL/etc:/etc"
- "/var/lib/libvirt/MYSQL/mysql_data:/var/lib/mysql"
- "/var/lib/libvirt/MYSQL/BACKUP:/BACKUP"
- "/var/lib/libvirt/NFS:/NFS"
ports:
- "3306:3306"
extra_hosts:
- "localhost:127.0.0.1"
- "centos7-mariadb103:127.0.0.1"
```
docker-compose 명령을 통해 다음과 같이 실행한다.
```bash
# docker-compose up -d
```
**!참고** : portainer의 docker-compose.yml 내역
```bash
# cat docker-compose.yml
version: '3'
services:
portainer:
image: portainer/portainer-ce:latest
container_name: portainer
restart: always
ports:
- 9000:9000
volumes:
- /var/run/docker.sock:/var/run/docker.sock
- /DOCKERS/portainer/data:/data
```
최종적으로 컨테이너의 실행 상태는 다음과 같다.
```bash
# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
dcf2a1815dc0 registry.hongsnet.net/joohan.hong/docker/mariadb:centos7-10.3_20210116 "/usr/bin/supervisor…" 3 weeks ago Up 3 weeks 0.0.0.0:3306->3306/tcp centos7.6-mariadb10.3
c87da9710121 portainer/portainer-ce:latest "/portainer" 3 weeks ago Up 3 weeks 8000/tcp, 0.0.0.0:9000->9000/tcp portainer
```
## Portainer를 이용한 관리
> 접속주소 : https://port250.hongsnet.net
![port1](uploads/189225f8b06540b3d396f501b2302c66/port1.png)
![port2](uploads/0ef602c4a293cc155b56e97be09c33af/port2.png)
![port3](uploads/2a6d0aa9919c97d997f3158ffa5edbb7/port3.png)
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