Network links in Compose file

Hai semuanya, di materi kali ini kita akan membahas legacy network di docker yaitu menggunakan links pada compose file.

Links allow you to define extra aliases by which a service is reachable from another service. They are not required to enable services to communicate - by default, any service can reach any other service at that service’s name. In the following example, db is reachable from web at the hostnames db and database:

Sekarang kita coba jalankan maka hasilnya seperti berikut:

➜ docker  docker-compose -f .\09-docker-compose\network\link.docker-compose.yaml -p link up -d
Creating network "link_default" with the default driver
Creating volume "link_mysql_data" with default driver
Creating link_mysql_1 ... done
Creating link_wordpress_1 ... done

➜ docker  docker-compose -f .\09-docker-compose\network\link.docker-compose.yaml -p link ps
      Name                    Command               State                  Ports
------------------------------------------------------------------------------------------------
link_mysql_1       docker-entrypoint.sh mysqld      Up      3306/tcp, 33060/tcp
link_wordpress_1   docker-entrypoint.sh apach ...   Up      0.0.0.0:8080->80/tcp,:::8080->80/tcp

➜ docker  docker-compose -f .\09-docker-compose\network\link.docker-compose.yaml -p link logs wordpress
Attaching to link_wordpress_1
wordpress_1  | WordPress not found in /var/www/html - copying now...
wordpress_1  | Complete! WordPress has been successfully copied to /var/www/html
wordpress_1  | No 'wp-config.php' found in /var/www/html, but 'WORDPRESS_...' variables supplied; copying
 'wp-config-docker.php' (WORDPRESS_DB_HOST WORDPRESS_DB_NAME WORDPRESS_DB_PASSWORD WORDPRESS_DB_USER)
wordpress_1  | AH00558: apache2: Could not reliably determine the server's fully qualified domain name, u
sing 172.20.0.3. Set the 'ServerName' directive globally to suppress this message
wordpress_1  | AH00558: apache2: Could not reliably determine the server's fully qualified domain name, u
sing 172.20.0.3. Set the 'ServerName' directive globally to suppress this message
wordpress_1  | [Mon Aug 23 20:35:12.754365 2021] [mpm_prefork:notice] [pid 1] AH00163: Apache/2.4.48 (Deb
ian) PHP/7.4.22 configured -- resuming normal operations
wordpress_1  | [Mon Aug 23 20:35:12.754459 2021] [core:notice] [pid 1] AH00094: Command line: 'apache2 -D
 FOREGROUND'

➜ docker  docker network ls -f name=link*
NETWORK ID     NAME           DRIVER    SCOPE
f93145728402   link_default   bridge    local

➜ docker  docker container inspect $(docker-compose -f .\09-docker-compose\network\link.docker-compose.yaml -p link ps -q) -f '{{.Name}} => {{json .NetworkSettings.Networks.link_default.Links}}'
/link_mysql_1 => null
/link_wordpress_1 => 
["link_mysql_1:db",
 "link_mysql_1:link_mysql_1",
 "link_mysql_1:mysql_1"]

➜ docker  docker container inspect $(docker-compose -f .\09-docker-compose\network\link.docker-compose.yaml -p link ps -q) -f '{{.Name}} => {{json .Config.Env}}'
/link_mysql_1 => 
["MYSQL_DATABASE=wordpress_db",
 "MYSQL_USER=wordpress_user",
 "MYSQL_PASSWORD=wordpress_user",
 "MYSQL_ROOT_PASSWORD=secretPassword"]
/link_wordpress_1 => 
[ "WORDPRESS_DB_HOST=db", 
  "WORDPRESS_DB_USER=wordpress_user", 
  "WORDPRESS_DB_PASSWORD=wordpress_user",
  "WORDPRESS_DB_NAME=wordpress_db"]

➜ docker  docker container inspect $(docker-compose -f .\09-docker-compose\network\link.docker-compose.yaml -p link ps -q) -f '{{.Name}} => {{json .NetworkSettings.Networks.link_default.Aliases}}'
/link_mysql_1 => ["6db651322822","mysql"]
/link_wordpress_1 => ["wordpress","9a45840e15e0"]

➜ docker  docker-compose -f .\09-docker-compose\network\link.docker-compose.yaml -p link exec mysql mysql -u wordpress_user --database wordpress_db -p

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 19
Server version: 5.7.35 MySQL Community Server (GPL)

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show tables;
+------------------------+
| Tables_in_wordpress_db |
+------------------------+
| wp_commentmeta         |
| wp_comments            |
| wp_links               |
| wp_options             |
| wp_postmeta            |
| wp_posts               |
| wp_term_relationships  |
| wp_term_taxonomy       |
| wp_termmeta            |
| wp_terms               |
| wp_usermeta            |
| wp_users               |
+------------------------+
12 rows in set (0.00 sec)

mysql> select * from wp_users;
+----+------------+------------------------------------+---------------+-----------------------------+-----------------------+---------------------+---------------------+-------------+--------------+
| ID | user_login | user_pass                          | user_nicename | user_email                  | user_url              | user_registered     | user_activation_key | user_status | display_name |
+----+------------+------------------------------------+---------------+-----------------------------+-----------------------+---------------------+---------------------+-------------+--------------+
|  1 | dimasm93   | $P$BJ61phmiwXQ7dOBacO08nuvIPyFftS1 | dimasm93      | software.dimas_m@icloud.com | http://localhost:8080 | 2021-08-23 20:50:46 |                     |           0 | dimasm93     |
+----+------------+------------------------------------+---------------+-----------------------------+-----------------------+---------------------+---------------------+-------------+--------------+
1 row in set (0.00 sec)

Sekarang coba buka alamat http://localhost:8080 maka hasilnya seperti berikut:

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