情景
在使用docker-compose启动服务的时候，执行下面的命令即可
# 前台启动
docker-compose up
# 后台启动
docker-compose up -d
那么当服务已经启动的情况下，再次执行docker-compose up会是什么功能？
从以往经验看，似乎会更新docker-compose启动的服务。下面验证一下
验证
启动一组docker-compose
随便起一个服务，docker-compose.yml如下：
version: '2'
services:
web:
image: "nginx:alpine"
ports:
- "80:80"
volumes:
- my-vol:/var/www/html
db:
image: "mysql"
restart: always
environment:
MYSQL_ROOT_PASSWORD: password
volumes:
my-vol: {}
随后启动
root@wang-PC:/home/wang/docker_compose_test# docker-compose up
Pulling web (nginx:alpine)...
alpine: Pulling from library/nginx
9b18e9b68314: Pull complete
51048c2d0108: Downloading [================================================> ] 7.113MB/7.297MB
51048c2d0108: Pull complete
3897c47760f3: Pull complete
f61a6b717778: Pull complete
56ed090e0ec8: Pull complete
e5a0a61a0146: Pull complete
Digest: sha256:082f8c10bd47b6acc8ef15ae61ae45dd8fde0e9f389a8b5cb23c37408642bf5d
Status: Downloaded newer image for nginx:alpine
Pulling db (mysql:)...
latest: Pulling from library/mysql
9a8b791677e1: Pull complete
51c023923f62: Pull complete
af22db8f5e18: Pull complete
428c3a923aa3: Pull complete
830d9608cd58: Pull complete
9914654f8cd5: Pull complete
22a35992845d: Downloading [==========================> ] 28.47MB/53.82MB
54d4540528c8: Download complete
4c6ec168f6cf: Download complete
22a35992845d: Downloading [========================================> ] 44.01MB/53.82MB
27e5cc37f4b1: Download complete
22a35992845d: Downloading [==============================================> ] 50.43MB/53.82MB
22a35992845d: Pull complete
54d4540528c8: Pull complete
4c6ec168f6cf: Pull complete
1742f8a782c5: Pull complete
27e5cc37f4b1: Pull complete
Digest: sha256:b9532b1edea72b6cee12d9f5a78547bd3812ea5db842566e17f8b33291ed2921
Status: Downloaded newer image for mysql:latest
Creating docker_compose_test_web_1 ... done
Creating docker_compose_test_db_1 ... done
Attaching to docker_compose_test_web_1, docker_compose_test_db_1
web_1 | /docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
web_1 | /docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
web_1 | /docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
web_1 | 10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
db_1 | 2022-09-20 02:52:59+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.30-1.el8 started.
web_1 | 10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
web_1 | /docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
web_1 | /docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
web_1 | /docker-entrypoint.sh: Configuration complete; ready for start up
web_1 | 2022/09/20 02:52:59 [notice] 1#1: using the "epoll" event method
web_1 | 2022/09/20 02:52:59 [notice] 1#1: nginx/1.23.1
web_1 | 2022/09/20 02:52:59 [notice] 1#1: built by gcc 11.2.1 20220219 (Alpine 11.2.1_git20220219)
web_1 | 2022/09/20 02:52:59 [notice] 1#1: OS: Linux 4.19.71-arm64-desktop
web_1 | 2022/09/20 02:52:59 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker processes
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 31
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 32
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 33
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 34
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 35
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 36
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 37
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 38
db_1 | 2022-09-20 02:52:59+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql'
db_1 | 2022-09-20 02:52:59+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.30-1.el8 started.
db_1 | 2022-09-20 02:52:59+00:00 [Note] [Entrypoint]: Initializing database files
db_1 | 2022-09-20T02:52:59.832257Z 0 [Warning] [MY-011068] [Server] The syntax '--skip-host-cache' is deprecated and will be removed in a future release. Please use SET GLOBAL host_cache_size=0 instead.
db_1 | 2022-09-20T02:52:59.832346Z 0 [System] [MY-013169] [Server] /usr/sbin/mysqld (mysqld 8.0.30) initializing of server in progress as process 81
db_1 | 2022-09-20T02:52:59.840806Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
db_1 | 2022-09-20T02:53:00.448205Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
db_1 | 2022-09-20T02:53:01.794720Z 6 [Warning] [MY-010453] [Server] root@localhost is created with an empty password ! Please consider switching off the --initialize-insecure option.
db_1 | 2022-09-20 02:53:05+00:00 [Note] [Entrypoint]: Database files initialized
db_1 | 2022-09-20 02:53:05+00:00 [Note] [Entrypoint]: Starting temporary server
db_1 | 2022-09-20T02:53:05.298592Z 0 [Warning] [MY-011068] [Server] The syntax '--skip-host-cache' is deprecated and will be removed in a future release. Please use SET GLOBAL host_cache_size=0 instead.
db_1 | 2022-09-20T02:53:05.299705Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.30) starting as process 132
db_1 | 2022-09-20T02:53:05.317821Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
db_1 | 2022-09-20T02:53:05.472012Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
db_1 | 2022-09-20T02:53:05.712884Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
db_1 | 2022-09-20T02:53:05.712946Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
db_1 | 2022-09-20T02:53:05.716462Z 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.
db_1 | 2022-09-20T02:53:05.739808Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.30' socket: '/var/run/mysqld/mysqld.sock' port: 0 MySQL Community Server - GPL.
db_1 | 2022-09-20T02:53:05.739765Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Socket: /var/run/mysqld/mysqlx.sock
db_1 | 2022-09-20 02:53:05+00:00 [Note] [Entrypoint]: Temporary server started.
db_1 | '/var/lib/mysql/mysql.sock' -> '/var/run/mysqld/mysqld.sock'
web_1 | 172.18.0.1 - - [20/Sep/2022:02:53:06 +0000] "HEAD / HTTP/1.1" 200 0 "-" "Mozilla/5.0 (X11; Linux aarch64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36" "-"
web_1 | 172.18.0.1 - - [20/Sep/2022:02:53:06 +0000] "HEAD / HTTP/1.1" 200 0 "-" "Mozilla/5.0 (X11; Linux aarch64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36" "-"
db_1 | Warning: Unable to load '/usr/share/zoneinfo/iso3166.tab' as time zone. Skipping it.
db_1 | Warning: Unable to load '/usr/share/zoneinfo/leapseconds' as time zone. Skipping it.
db_1 | Warning: Unable to load '/usr/share/zoneinfo/tzdata.zi' as time zone. Skipping it.
db_1 | Warning: Unable to load '/usr/share/zoneinfo/zone.tab' as time zone. Skipping it.
db_1 | Warning: Unable to load '/usr/share/zoneinfo/zone1970.tab' as time zone. Skipping it.
db_1 |
db_1 | 2022-09-20 02:53:07+00:00 [Note] [Entrypoint]: Stopping temporary server
db_1 | 2022-09-20T02:53:07.851225Z 10 [System] [MY-013172] [Server] Received SHUTDOWN from user root. Shutting down mysqld (Version: 8.0.30).
db_1 | 2022-09-20T02:53:09.522259Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.30) MySQL Community Server - GPL.
db_1 | 2022-09-20 02:53:09+00:00 [Note] [Entrypoint]: Temporary server stopped
db_1 |
db_1 | 2022-09-20 02:53:09+00:00 [Note] [Entrypoint]: MySQL init process done. Ready for start up.
db_1 |
db_1 | 2022-09-20T02:53:10.108489Z 0 [Warning] [MY-011068] [Server] The syntax '--skip-host-cache' is deprecated and will be removed in a future release. Please use SET GLOBAL host_cache_size=0 instead.
db_1 | 2022-09-20T02:53:10.109510Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.30) starting as process 1
db_1 | 2022-09-20T02:53:10.115120Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
db_1 | 2022-09-20T02:53:10.258746Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
db_1 | 2022-09-20T02:53:10.432465Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
db_1 | 2022-09-20T02:53:10.432507Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
db_1 | 2022-09-20T02:53:10.434719Z 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.
db_1 | 2022-09-20T02:53:10.459444Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.30' socket: '/var/run/mysqld/mysqld.sock' port: 3306 MySQL Community Server - GPL.
db_1 | 2022-09-20T02:53:10.459481Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
可以看到，会先下载镜像，随后启动服务。
执行 docker ps来查看容器启动情况，可以看到两个服务都正常启动
wang@wang-PC:~/docker_compose_test$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
74324c4961ae mysql "docker-entrypoint.s…" 3 hours ago Up 3 hours 3306/tcp, 33060/tcp docker_compose_test_db_1
c32f33c2f88a nginx:alpine "/docker-entrypoint.…" 3 hours ago Up 3 hours 0.0.0.0:80->80/tcp docker_compose_test_web_1
在文件夹下再次执行docker-compose up
再打开一个终端，在项目文件夹下执行docker-compose up
wang@wang-PC:~/docker_compose_test$ docker-compose up
docker_compose_test_web_1 is up-to-date
docker_compose_test_db_1 is up-to-date
Attaching to docker_compose_test_web_1, docker_compose_test_db_1
web_1 | /docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
web_1 | /docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
web_1 | /docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
web_1 | 10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
web_1 | 10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
web_1 | /docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
web_1 | /docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
web_1 | /docker-entrypoint.sh: Configuration complete; ready for start up
web_1 | 2022/09/20 02:52:59 [notice] 1#1: using the "epoll" event method
web_1 | 2022/09/20 02:52:59 [notice] 1#1: nginx/1.23.1
web_1 | 2022/09/20 02:52:59 [notice] 1#1: built by gcc 11.2.1 20220219 (Alpine 11.2.1_git20220219)
web_1 | 2022/09/20 02:52:59 [notice] 1#1: OS: Linux 4.19.71-arm64-desktop
web_1 | 2022/09/20 02:52:59 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker processes
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 31
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 32
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 33
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 34
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 35
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 36
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 37
web_1 | 2022/09/20 02:52:59 [notice] 1#1: start worker process 38
可以看到，前两行日志，提示的是 两个服务都已经是最新状态 。然后会attach到容器中打印执行日志，和启动服务时，没有差异。
那如果对服务进行一些变更，再执行，是否会更新服务？
更新yml后再执行docker-compose up
对yml进行一些变更，此处为增加一个映射端口，修改成
version: '2'
services:
web:
image: "nginx:alpine"
ports:
- "80:80"
- "8080:8080"
volumes:
- my-vol:/var/www/html
db:
image: "mysql"
restart: always
environment:
MYSQL_ROOT_PASSWORD: password
volumes:
my-vol: {}
不关服务，再次执行docker-compose up
wang@wang-PC:~/docker_compose_test$ docker-compose up
Recreating docker_compose_test_web_1 ...
Recreating docker_compose_test_web_1 ... done
Attaching to docker_compose_test_db_1, docker_compose_test_web_1
web_1 | /docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
web_1 | /docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
web_1 | /docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
web_1 | 10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
web_1 | 10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
web_1 | /docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
web_1 | /docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
web_1 | /docker-entrypoint.sh: Configuration complete; ready for start up
web_1 | 2022/09/20 06:32:10 [notice] 1#1: using the "epoll" event method
web_1 | 2022/09/20 06:32:10 [notice] 1#1: nginx/1.23.1
web_1 | 2022/09/20 06:32:10 [notice] 1#1: built by gcc 11.2.1 20220219 (Alpine 11.2.1_git20220219)
web_1 | 2022/09/20 06:32:10 [notice] 1#1: OS: Linux 4.19.71-arm64-desktop
web_1 | 2022/09/20 06:32:10 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576
web_1 | 2022/09/20 06:32:10 [notice] 1#1: start worker processes
web_1 | 2022/09/20 06:32:10 [notice] 1#1: start worker process 31
web_1 | 2022/09/20 06:32:10 [notice] 1#1: start worker process 32
web_1 | 2022/09/20 06:32:10 [notice] 1#1: start worker process 33
web_1 | 2022/09/20 06:32:10 [notice] 1#1: start worker process 34
web_1 | 2022/09/20 06:32:10 [notice] 1#1: start worker process 35
web_1 | 2022/09/20 06:32:10 [notice] 1#1: start worker process 36
web_1 | 2022/09/20 06:32:10 [notice] 1#1: start worker process 37
web_1 | 2022/09/20 06:32:10 [notice] 1#1: start worker process 38
db_1 | 2022-09-20 02:52:59+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.30-1.el8 started.
db_1 | 2022-09-20 02:52:59+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql'
db_1 | 2022-09-20 02:52:59+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.30-1.el8 started.
db_1 | 2022-09-20 02:52:59+00:00 [Note] [Entrypoint]: Initializing database files
db_1 | 2022-09-20T02:52:59.832257Z 0 [Warning] [MY-011068] [Server] The syntax '--skip-host-cache' is deprecated and will be removed in a future release. Please use SET GLOBAL host_cache_size=0 instead.
db_1 | 2022-09-20T02:52:59.832346Z 0 [System] [MY-013169] [Server] /usr/sbin/mysqld (mysqld 8.0.30) initializing of server in progress as process 81
db_1 | 2022-09-20T02:52:59.840806Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
db_1 | 2022-09-20T02:53:00.448205Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
db_1 | 2022-09-20T02:53:01.794720Z 6 [Warning] [MY-010453] [Server] root@localhost is created with an empty password ! Please consider switching off the --initialize-insecure option.
db_1 | 2022-09-20 02:53:05+00:00 [Note] [Entrypoint]: Database files initialized
db_1 | 2022-09-20 02:53:05+00:00 [Note] [Entrypoint]: Starting temporary server
db_1 | 2022-09-20T02:53:05.298592Z 0 [Warning] [MY-011068] [Server] The syntax '--skip-host-cache' is deprecated and will be removed in a future release. Please use SET GLOBAL host_cache_size=0 instead.
db_1 | 2022-09-20T02:53:05.299705Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.30) starting as process 132
db_1 | 2022-09-20T02:53:05.317821Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
db_1 | 2022-09-20T02:53:05.472012Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
db_1 | 2022-09-20T02:53:05.712884Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
db_1 | 2022-09-20T02:53:05.712946Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
db_1 | 2022-09-20T02:53:05.716462Z 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.
db_1 | 2022-09-20T02:53:05.739808Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.30' socket: '/var/run/mysqld/mysqld.sock' port: 0 MySQL Community Server - GPL.
db_1 | 2022-09-20T02:53:05.739765Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Socket: /var/run/mysqld/mysqlx.sock
db_1 | 2022-09-20 02:53:05+00:00 [Note] [Entrypoint]: Temporary server started.
db_1 | '/var/lib/mysql/mysql.sock' -> '/var/run/mysqld/mysqld.sock'
db_1 | Warning: Unable to load '/usr/share/zoneinfo/iso3166.tab' as time zone. Skipping it.
db_1 | Warning: Unable to load '/usr/share/zoneinfo/leapseconds' as time zone. Skipping it.
db_1 | Warning: Unable to load '/usr/share/zoneinfo/tzdata.zi' as time zone. Skipping it.
db_1 | Warning: Unable to load '/usr/share/zoneinfo/zone.tab' as time zone. Skipping it.
db_1 | Warning: Unable to load '/usr/share/zoneinfo/zone1970.tab' as time zone. Skipping it.
db_1 |
db_1 | 2022-09-20 02:53:07+00:00 [Note] [Entrypoint]: Stopping temporary server
db_1 | 2022-09-20T02:53:07.851225Z 10 [System] [MY-013172] [Server] Received SHUTDOWN from user root. Shutting down mysqld (Version: 8.0.30).
db_1 | 2022-09-20T02:53:09.522259Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.30) MySQL Community Server - GPL.
db_1 | 2022-09-20 02:53:09+00:00 [Note] [Entrypoint]: Temporary server stopped
db_1 |
db_1 | 2022-09-20 02:53:09+00:00 [Note] [Entrypoint]: MySQL init process done. Ready for start up.
db_1 |
db_1 | 2022-09-20T02:53:10.108489Z 0 [Warning] [MY-011068] [Server] The syntax '--skip-host-cache' is deprecated and will be removed in a future release. Please use SET GLOBAL host_cache_size=0 instead.
db_1 | 2022-09-20T02:53:10.109510Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.30) starting as process 1
db_1 | 2022-09-20T02:53:10.115120Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
db_1 | 2022-09-20T02:53:10.258746Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
db_1 | 2022-09-20T02:53:10.432465Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
db_1 | 2022-09-20T02:53:10.432507Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
db_1 | 2022-09-20T02:53:10.434719Z 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.
db_1 | 2022-09-20T02:53:10.459444Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.30' socket: '/var/run/mysqld/mysqld.sock' port: 3306 MySQL Community Server - GPL.
db_1 | 2022-09-20T02:53:10.459481Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
web_1 | 172.18.0.1 - - [20/Sep/2022:06:32:12 +0000] "HEAD / HTTP/1.1" 200 0 "-" "Mozilla/5.0 (X11; Linux aarch64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36" "-"
web_1 | 172.18.0.1 - - [20/Sep/2022:06:32:12 +0000] "HEAD / HTTP/1.1" 200 0 "-" "Mozilla/5.0 (X11; Linux aarch64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36" "-"
web_1 | 172.18.0.1 - - [20/Sep/2022:06:32:14 +0000] "HEAD / HTTP/1.1" 200 0 "-" "Mozilla/5.0 (X11; Linux aarch64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36" "-"
web_1 | 172.18.0.1 - - [20/Sep/2022:06:32:14 +0000] "HEAD / HTTP/1.1" 200 0 "-" "Mozilla/5.0 (X11; Linux aarch64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36" "-"
web_1 | 172.18.0.1 - - [20/Sep/2022:06:32:14 +0000] "HEAD / HTTP/1.1" 200 0 "-" "Mozilla/5.0 (X11; Linux aarch64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36" "-"
关注前两行，会发现，由于更新了配置，web容器重新创建了。
随后attach到容器中，打印其执行日志。
也就是说，更新了配置文件的service，再执行docker-compose会重新创建，没有更新的不会重启、更新。