Containers series III: Docker Compose
Serie de artigos sobre containers (Docker, Docker Compose, Docker Swarm e Kubernetes).
Lab 3 - Docker Compose
Executando servicos
Docker Compose permite definir serviços (que a sua vez são formados por containers) e a comunicação entre os mesmos. Esta comunicação é implementada via DNS nos containers. Além disso, no arquivo de configuração do Docker Compose (docker-compose.yml) é possível definir:
- variáveis de entorno: comando
environment - mapeamento de portas: comando
ports - persistência de dados: comando
volumes - dependências entre os serviços: comandos
linksedepends on
Vamos trabalhar com dois terminais abertos (T1 e T2).
Instalação
-
[T1] Instalação do Docker Compose:
[Ubuntu]
$ sudo apt install docker-compose -y Reading package lists... Done Building dependency tree Reading state information... Done The following additional packages will be installed: golang-docker-credential-helpers libpython-stdlib libpython2.7-minimal libpython2.7-stdlib libsecret-1-0 libsecret-common python python-asn1crypto python-backports.ssl-match-hostname python-cached-property python-certifi python-cffi-backend python-chardet python-cryptography python-docker python-dockerpty python-dockerpycreds python-docopt python-enum34 python-funcsigs python-functools32 python-idna python-ipaddress python-jsonschema python-minimal python-mock python-openssl python-pbr python-pkg-resources python-requests python-six python-texttable python-urllib3 python-websocket python-yaml python2.7 python2.7-minimal Suggested packages: python-doc python-tk python-cryptography-doc python-cryptography-vectors python-enum34-doc python-funcsigs-doc python-mock-doc python-openssl-doc python-openssl-dbg python-setuptools python-socks python-ntlm python2.7-doc binutils binfmt-support The following NEW packages will be installed: docker-compose golang-docker-credential-helpers libpython-stdlib libpython2.7-minimal libpython2.7-stdlib libsecret-1-0 libsecret-common python python-asn1crypto python-backports.ssl-match-hostname python-cached-property python-certifi python-cffi-backend python-chardet python-cryptography python-docker python-dockerpty python-dockerpycreds python-docopt python-enum34 python-funcsigs python-functools32 python-idna python-ipaddress python-jsonschema python-minimal python-mock python-openssl python-pbr python-pkg-resources python-requests python-six python-texttable python-urllib3 python-websocket python-yaml python2.7 python2.7-minimal 0 upgraded, 38 newly installed, 0 to remove and 35 not upgraded. Need to get 6014 kB of archives. After this operation, 26.6 MB of additional disk space will be used. 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Setting up python-pbr (3.1.1-3ubuntu3) ... update-alternatives: using /usr/bin/python2-pbr to provide /usr/bin/pbr (pbr) in auto mode Setting up python-enum34 (1.1.6-2) ... Setting up python-funcsigs (1.0.2-4) ... Setting up python-docopt (0.6.2-1build1) ... Setting up python-ipaddress (1.0.17-1) ... Setting up python-cached-property (1.3.1-1) ... Setting up python-urllib3 (1.22-1ubuntu0.18.04.1) ... Setting up python-chardet (3.0.4-1) ... Setting up python-dockerpycreds (0.2.1-1) ... Setting up python-mock (2.0.0-3) ... Setting up python-websocket (0.44.0-0ubuntu2) ... update-alternatives: using /usr/bin/python2-wsdump to provide /usr/bin/wsdump (wsdump) in auto mode Setting up python-cryptography (2.1.4-1ubuntu1.3) ... Setting up python-requests (2.18.4-2ubuntu0.1) ... Setting up python-jsonschema (2.6.0-2) ... update-alternatives: using /usr/bin/python2-jsonschema to provide /usr/bin/jsonschema (jsonschema) in auto mode Setting up python-openssl (17.5.0-1ubuntu1) ... Setting up python-docker (2.5.1-1) ... Setting up docker-compose (1.17.1-2) ... Processing triggers for man-db (2.8.3-2ubuntu0.1) ... Processing triggers for mime-support (3.60ubuntu1) ... Processing triggers for libc-bin (2.27-3ubuntu1) ...[Amazon Linux]
$ sudo curl -L https://github.com/docker/compose/releases/latest/download/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 152 100 152 0 0 4252 0 --:--:-- --:--:-- --:--:-- 4342 100 664 100 664 0 0 16586 0 --:--:-- --:--:-- --:--:-- 16586 100 23.5M 100 23.5M 0 0 84.2M 0 --:--:-- --:--:-- --:--:-- 84.2M $ sudo chmod +x /usr/local/bin/docker-compose $ docker-compose version[Amazon Linux] Instalar o git:
$ sudo yum install -y git - [T1] Clonar este repositório e navegar ate a pasta
/fiap/bdt/microservices:$ git clone https://github.com/josecastillolema/fiap.git $ cd fiap/bdt/microservices/compose $ pwd /home/ubuntu/fiap/bdt/microservices/compose $ ls api_v1 api_v2 api_v3 docker-compose.yml mongo mysql - [T1] Mostrar o conteúdo do arquivo
docker-compose.yml. São definidos dois serviços:- api: a API escrita em Python, que tem dependência com (consulta) o serviço mysql
- mysql: o servidor MySQL, com mapeamento de portas (porta 3306), persistência de dados (pasta
/var/lib/mysql) e algumas variáveis de entorno$ cat docker-compose.yml version: '2' services: api: build: api_v2/. ports: - "4000:5000" depends_on: - mysql mysql: build: mysql/. ports: - "3306:3306" volumes: - /var/lib/mysql environment: MYSQL_ROOT_PASSWORD: senhaFiap MYSQL_DATABASE: fiapdb
Uso
- [T1] Criar os serviços definidos no arquivo
docker-compose.yml:$ docker-compose up Creating network "compose_default" with the default driver Building mysql Step 1/3 : FROM mysql ---> 9228ee8bac7a Step 2/3 : MAINTAINER Jose Castillo <profjose.lema@fiap.com.br> ---> Running in 5f85965fa52d Removing intermediate container 5f85965fa52d ---> 1035c57e599d Step 3/3 : ADD ./aso.sql /docker-entrypoint-initdb.d ---> a809a9c5ca56 Successfully built a809a9c5ca56 Successfully tagged compose_mysql:latest WARNING: Image for service mysql was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`. Building api Step 1/8 : FROM python:2 ---> 154f4db0c875 Step 2/8 : MAINTAINER Jose Castillo <profjose.lema@fiap.com.br> ---> Using cache ---> defda7283ddf Step 3/8 : ADD api.py requirements.txt / ---> abb5e8e662ca Step 4/8 : RUN pip install -r ./requirements.txt ---> Running in ebd156421186 DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support Collecting flask Downloading Flask-1.1.2-py2.py3-none-any.whl (94 kB) Collecting flask-mysql Downloading Flask_MySQL-1.5.1-py2.py3-none-any.whl (3.8 kB) Collecting flask-cors Downloading Flask_Cors-3.0.8-py2.py3-none-any.whl (14 kB) Collecting cryptography Downloading cryptography-2.9-cp27-cp27mu-manylinux2010_x86_64.whl (2.7 MB) Collecting click>=5.1 Downloading click-7.1.1-py2.py3-none-any.whl (82 kB) Collecting itsdangerous>=0.24 Downloading itsdangerous-1.1.0-py2.py3-none-any.whl (16 kB) Collecting Werkzeug>=0.15 Downloading Werkzeug-1.0.1-py2.py3-none-any.whl (298 kB) Collecting Jinja2>=2.10.1 Downloading Jinja2-2.11.1-py2.py3-none-any.whl (126 kB) Collecting PyMySQL Downloading PyMySQL-0.9.3-py2.py3-none-any.whl (47 kB) Requirement already satisfied: Six in /usr/local/lib/python2.7/site-packages (from flask-cors->-r ./requirements.txt (line 3)) (1.14.0) Collecting ipaddress; python_version < "3" Downloading ipaddress-1.0.23-py2.py3-none-any.whl (18 kB) Collecting cffi!=1.11.3,>=1.8 Downloading cffi-1.14.0-cp27-cp27mu-manylinux1_x86_64.whl (387 kB) Collecting enum34; python_version < "3" Downloading enum34-1.1.10-py2-none-any.whl (11 kB) Collecting MarkupSafe>=0.23 Downloading MarkupSafe-1.1.1-cp27-cp27mu-manylinux1_x86_64.whl (24 kB) Collecting pycparser Downloading pycparser-2.20-py2.py3-none-any.whl (112 kB) Installing collected packages: click, itsdangerous, Werkzeug, MarkupSafe, Jinja2, flask, PyMySQL, flask-mysql, flask-cors, ipaddress, pycparser, cffi, enum34, cryptography Successfully installed Jinja2-2.11.1 MarkupSafe-1.1.1 PyMySQL-0.9.3 Werkzeug-1.0.1 cffi-1.14.0 click-7.1.1 cryptography-2.9 enum34-1.1.10 flask-1.1.2 flask-cors-3.0.8 flask-mysql-1.5.1 ipaddress-1.0.23 itsdangerous-1.1.0 pycparser-2.20 Removing intermediate container ebd156421186 ---> 1897edcddbb5 Step 5/8 : ENV PORT=5000 ---> Running in 8dd8bb035819 Removing intermediate container 8dd8bb035819 ---> 3b92b6fb59a5 Step 6/8 : EXPOSE $PORT ---> Running in 99d862666779 Removing intermediate container 99d862666779 ---> 05c77804ed9d Step 7/8 : HEALTHCHECK CMD curl --fail http://localhost:$PORT || exit 1 ---> Running in ecbcbde1d83c Removing intermediate container ecbcbde1d83c ---> 178843362cde Step 8/8 : CMD [ "./api.py" ] ---> Running in bfe14e880a4b Removing intermediate container bfe14e880a4b ---> e401dc1035d7 Successfully built e401dc1035d7 Successfully tagged compose_api:latest WARNING: Image for service api was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`. Creating compose_mysql_1 ... Creating compose_mysql_1 ... done Creating compose_api_1 ... Creating compose_api_1 ... done Attaching to compose_mysql_1, compose_api_1 mysql_1 | 2020-04-08 19:52:56+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.19-1debian10 started. mysql_1 | 2020-04-08 19:52:57+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql' mysql_1 | 2020-04-08 19:52:57+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.19-1debian10 started. mysql_1 | 2020-04-08 19:52:57+00:00 [Note] [Entrypoint]: Initializing database files mysql_1 | 2020-04-08T19:52:57.639740Z 0 [Warning] [MY-011070] [Server] 'Disabling symbolic links using --skip-symbolic-links (or equivalent) is the default. Consider not using this option as it' is deprecated and will be removed in a future release. mysql_1 | 2020-04-08T19:52:57.639830Z 0 [System] [MY-013169] [Server] /usr/sbin/mysqld (mysqld 8.0.19) initializing of server in progress as process 41 api_1 | * Serving Flask app "api" (lazy loading) api_1 | * Environment: production api_1 | WARNING: This is a development server. Do not use it in a production deployment. api_1 | Use a production WSGI server instead. api_1 | * Debug mode: on api_1 | * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit) api_1 | * Restarting with stat api_1 | * Debugger is active! api_1 | * Debugger PIN: 463-518-758 mysql_1 | 2020-04-08T19:53:03.024229Z 5 [Warning] [MY-010453] [Server] root@localhost is created with an empty password ! Please consider switching off the --initialize-insecure option. mysql_1 | 2020-04-08 19:53:08+00:00 [Note] [Entrypoint]: Database files initialized mysql_1 | 2020-04-08 19:53:08+00:00 [Note] [Entrypoint]: Starting temporary server mysql_1 | 2020-04-08T19:53:08.721880Z 0 [Warning] [MY-011070] [Server] 'Disabling symbolic links using --skip-symbolic-links (or equivalent) is the default. Consider not using this option as it' is deprecated and will be removed in a future release. mysql_1 | 2020-04-08T19:53:08.722007Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.19) starting as process 91 mysql_1 | 2020-04-08T19:53:09.446603Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed. mysql_1 | 2020-04-08T19:53:09.457240Z 0 [Warning] [MY-011810] [Server] Insecure configuration for --pid-file: Location '/var/run/mysqld' in the path is accessible to all OS users. Consider choosing a different directory. mysql_1 | 2020-04-08T19:53:09.478577Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.19' socket: '/var/run/mysqld/mysqld.sock' port: 0 MySQL Community Server - GPL. mysql_1 | 2020-04-08 19:53:09+00:00 [Note] [Entrypoint]: Temporary server started. mysql_1 | 2020-04-08T19:53:09.527830Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Socket: '/var/run/mysqld/mysqlx.sock' mysql_1 | Warning: Unable to load '/usr/share/zoneinfo/iso3166.tab' as time zone. Skipping it. mysql_1 | Warning: Unable to load '/usr/share/zoneinfo/leap-seconds.list' as time zone. Skipping it. mysql_1 | Warning: Unable to load '/usr/share/zoneinfo/zone.tab' as time zone. Skipping it. mysql_1 | Warning: Unable to load '/usr/share/zoneinfo/zone1970.tab' as time zone. Skipping it. mysql_1 | 2020-04-08 19:53:13+00:00 [Note] [Entrypoint]: Creating database fiapdb mysql_1 | mysql_1 | 2020-04-08 19:53:13+00:00 [Note] [Entrypoint]: /usr/local/bin/docker-entrypoint.sh: running /docker-entrypoint-initdb.d/aso.sql mysql_1 | mysql_1 | mysql_1 | 2020-04-08 19:53:14+00:00 [Note] [Entrypoint]: Stopping temporary server mysql_1 | 2020-04-08T19:53:14.140552Z 12 [System] [MY-013172] [Server] Received SHUTDOWN from user root. Shutting down mysqld (Version: 8.0.19). mysql_1 | 2020-04-08T19:53:15.777586Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.19) MySQL Community Server - GPL. mysql_1 | 2020-04-08 19:53:16+00:00 [Note] [Entrypoint]: Temporary server stopped mysql_1 | mysql_1 | 2020-04-08 19:53:16+00:00 [Note] [Entrypoint]: MySQL init process done. Ready for start up. mysql_1 | mysql_1 | 2020-04-08T19:53:16.482021Z 0 [Warning] [MY-011070] [Server] 'Disabling symbolic links using --skip-symbolic-links (or equivalent) is the default. Consider not using this option as it' is deprecated and will be removed in a future release. mysql_1 | 2020-04-08T19:53:16.482148Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.19) starting as process 1 mysql_1 | 2020-04-08T19:53:17.150498Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed. mysql_1 | 2020-04-08T19:53:17.159715Z 0 [Warning] [MY-011810] [Server] Insecure configuration for --pid-file: Location '/var/run/mysqld' in the path is accessible to all OS users. Consider choosing a different directory. mysql_1 | 2020-04-08T19:53:17.180954Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.19' socket: '/var/run/mysqld/mysqld.sock' port: 3306 MySQL Community Server - GPL. mysql_1 | 2020-04-08T19:53:17.291602Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Socket: '/var/run/mysqld/mysqlx.sock' bind-address: '::' port: 33060 -
[T1] (Opcional / Alternativa ao passo 4)
O comando anterior pode ser executado com a opção
-d. De esta forma os containers são executados no background, e não será necessário usar dois terminais. Porém, temos menos visibilidade no que está acontecendo nos containers:$ docker-compose up -d Creating network "compose_default" with the default driver Creating compose_mysql_1 ... Creating compose_mysql_1 ... done Creating compose_api_1 ... Creating compose_api_1 ... done
Validação
- [T2] Em um segundo terminal, confirmar que os serviços do Docker Compose foram criados corretamente. E necessário navegar ate pasta que contém o arquivo
docker-compose.yml.$ cd fiap/bdt/microservices/compose/ $ pwd /home/ubuntu/fiap/bdt/microservices/compose $ docker-compose ps Name Command State Ports ----------------------------------------------------------------------------------------- compose_api_1 ./api.py Up 0.0.0.0:4000->5000/tcp compose_mysql_1 docker-entrypoint.sh mysqld Up 0.0.0.0:3306->3306/tcp, 33060/tcp - [T2] Confirmar que os containers foram criados corretamente:
$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 6d7277694bc3 compose_api "./api.py" 2 minutes ago Up About a minute (healthy) 0.0.0.0:4000->5000/tcp compose_api_1 349228f10355 compose_mysql "docker-entrypoint.s…" 2 minutes ago Up 2 minutes 0.0.0.0:3306->3306/tcp, 33060/tcp compose_mysql_1 - [T2] Testar a API:
$ curl localhost:4000 Benvido a API FIAP! - [T2] Testar a conexão da API com o banco de dados:
$ curl localhost:4000/getDados [{"id": 1234, "name": "Jose Castillo Lema"}] - [T2] Conferir a configuração de DNS, usando o ID do container compose_api obtido no passo 7:
$ docker exec 6d7277694bc3 ping -c 3 mysql PING mysql (172.18.0.2) 56(84) bytes of data. 64 bytes from compose_mysql_1.compose_default (172.18.0.2): icmp_seq=1 ttl=64 time=0.073 ms 64 bytes from compose_mysql_1.compose_default (172.18.0.2): icmp_seq=2 ttl=64 time=0.070 ms 64 bytes from compose_mysql_1.compose_default (172.18.0.2): icmp_seq=3 ttl=64 time=0.072 ms --- mysql ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 35ms rtt min/avg/max/mdev = 0.070/0.071/0.073/0.009 ms
Clean-up
- [T2] Remover os serviços (e os containers):
$ docker-compose down Stopping compose_api_1 ... done Stopping compose_mysql_1 ... done Removing compose_api_1 ... done Removing compose_mysql_1 ... done Removing network compose_default
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