我下载了docker-compose.yml，然后使用docker-compose up -d，然后使用docker logs
发现以下错误：
…
waiting for mysql server to be ready: %s (2005, “Unknown MySQL server host ‘db’ (0)”)
…
请问该如何修复该问题？
这个日志信息理论上都会出现几次的，这是因为要等待mysql容器启动，你要等待几分钟，这个会自动处理的，最终应该是没有问题的
我后来重新学了一遍docker的网络，发现这应该是我改了docker-compose.yml的网络配置导致的。
因为我不想使用docker帮我创建的user defined network。所以改成了network_mode: host。
所以3个容器启动后，估计是没利用到docker embedded dns，因而seafile这个container并不知道如何去连接db这个container，故导致了找不到数据库的故障。后来我把网络改回原来默认的seafile-net，就可以正常启动了。
然而，我还是希望docker-compose能够利用我手工创建的user defined network(bridge)，这样我才能指定网段。所以又改了docker-compose.yml，当然这是后话了。
不管如何，这个故障的原因就是我所推测的，将docker-compose.yml的网络改成host之后，各个container之间无法找到对方，导致了数据库连接失败。
docker-compose.yml 示例里说暴露 80 端口，但我登录到docker里面怎么发现seahub 运行在8000端口，所以我把端口改成 8000：8000了
运行 docker-compose up -d 后发现服务都起来了，但是在浏览器里输入file.mycompany.com:8000 并不能访问。
我··docker exec -it 到 seafile container里面去， wget 127.0.0.1:8000’ 是可以拿到一个index.html页面，看起来是一个登陆页。但为什么在外面用域名不能访问呢？
我是完全按照文档https://cloud.seafile.com/published/seafile-manual-cn/docker/%E7%94%A8Docker%E9%83%A8%E7%BD%B2Seafile.md 来的，看起来不是文档有问题就是镜像有问题，帮忙指点一下？
version: '2.0'
services:
db:
image: mariadb:10.1
container_name: seafile-mysql
environment:
- MYSQL_ROOT_PASSWORD=mycompany # Requested, set the root's password of MySQL service.
- MYSQL_LOG_CONSOLE=true
volumes:
- /opt/seafile-mysql/db:/var/lib/mysql # Requested, specifies the path to MySQL data persistent store.
networks:
- seafile-net
memcached:
image: memcached:1.5.6
container_name: seafile-memcached
entrypoint: memcached -m 256
networks:
- seafile-net
seafile:
image: seafileltd/seafile-mc:latest
container_name: seafile
ports:
- "8000:8000"
- "443:443" # If https is enabled, cancel the comment.
volumes:
- /opt/seafile-data:/shared # Requested, specifies the path to Seafile data persistent store.
environment:
- DB_HOST=db
- DB_ROOT_PASSWD=mycompany # Requested, the value shuold be root's password of MySQL service.
# - TIME_ZONE=Asia/Shanghai # Optional, default is UTC. Should be uncomment and set to your local time zone.
- SEAFILE_ADMIN_EMAIL=me@mycompany.com # Specifies Seafile admin user, default is 'me@example.com'.
- SEAFILE_ADMIN_PASSWORD=asecret # Specifies Seafile admin password, default is 'asecret'.
- SEAFILE_SERVER_LETSENCRYPT=true # Whether to use https or not.
- SEAFILE_SERVER_HOSTNAME=file.mycompany.com # Specifies your host name if https is enabled.
depends_on:
- db
- memcached
networks:
- seafile-net
networks:
seafile-net:
运行 docker-compose up -d后发现服务都起来了，但是在浏览器里输入file.mycompany.com:8000 并不能访问。
我··docker exec -it 到 seafile container里面去，wget 127.0.0.1:8000’ 是可以拿到一个index.html页面，看起来是一个登陆页。但为什么在外面用域名不能访问呢？
[root@iz2ze78t84wkep9q8jsf4hz seafiles]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
bae82335eca9 seafileltd/seafile-mc:latest "/sbin/my_init -- ..." 3 hours ago Up 3 hours 80/tcp, 0.0.0.0:8000->8000/tcp seafile
97389e118d18 mariadb:10.1 "docker-entrypoint..." 3 hours ago Up 3 hours 3306/tcp seafile-mysql
7e248db3b46c memcached:1.5.6 "memcached -m 256" 3 hours ago Up 3 hours 11211/tcp seafile-memcached
[root@iz2ze78t84wkep9q8jsf4hz seafiles]# docker logs bae82335eca9
*** Running /etc/my_init.d/01_create_data_links.sh...
*** Running /etc/my_init.d/10_syslog-ng.init...
Aug 1 07:03:28 bae82335eca9 syslog-ng[19]: syslog-ng starting up; version='3.13.2'
*** Booting runit daemon...
*** Runit started as PID 27
*** Running /scripts/start.py...
Aug 1 07:03:29 bae82335eca9 cron[33]: (CRON) INFO (pidfile fd = 3)
Aug 1 07:03:29 bae82335eca9 cron[33]: (CRON) INFO (Running @reboot jobs)
[2019-08-01 07:03:46] Now running setup-seafile-mysql.py in auto mode.
Checking python on this machine ...
Checking python module: python-mysqldb ... Done.
done
Successly create configuration dir /opt/seafile/ccnet.
Done.
verifying password of user root ... done
---------------------------------
This is your configuration
---------------------------------
server name: seafile
server ip/domain: files.bimsop.com
seafile data dir: /opt/seafile/seafile-data
fileserver port: 8082
database: create new
ccnet database: ccnet_db
seafile database: seafile_db
seahub database: seahub_db
database user: seafile
Generating ccnet configuration ...
Generating seafile configuration ...
done
Generating seahub configuration ...
----------------------------------------
Now creating ccnet database tables ...
----------------------------------------
----------------------------------------
Now creating seafile database tables ...
----------------------------------------
----------------------------------------
Now creating seahub database tables ...
----------------------------------------
creating seafile-server-latest symbolic link ... done
-----------------------------------------------------------------
Your seafile server configuration has been finished successfully.
-----------------------------------------------------------------
run seafile server: ./seafile.sh { start | stop | restart }
run seahub server: ./seahub.sh { start <port> | stop | restart <port> }
-----------------------------------------------------------------
If you are behind a firewall, remember to allow input/output of these tcp ports:
-----------------------------------------------------------------
port of seafile fileserver: 8082
port of seahub: 8000
When problems occur, Refer to
https://github.com/haiwen/seafile/wiki
for information.
waiting for mysql server to be ready: %s (2003, "Can't connect to MySQL server on 'db' (111)")
waiting for mysql server to be ready: %s (2003, "Can't connect to MySQL server on 'db' (111)")
waiting for mysql server to be ready: %s (2003, "Can't connect to MySQL server on 'db' (111)")
waiting for mysql server to be ready: %s (2003, "Can't connect to MySQL server on 'db' (111)")
waiting for mysql server to be ready: %s (2003, "Can't connect to MySQL server on 'db' (111)")
waiting for mysql server to be ready: %s (2003, "Can't connect to MySQL server on 'db' (111)")
waiting for mysql server to be ready: %s (2003, "Can't connect to MySQL server on 'db' (111)")
waiting for mysql server to be ready: %s (2003, "Can't connect to MySQL server on 'db' (111)")
[08/01/2019 07:03:53][upgrade]: The container was recreated, running minor-upgrade.sh to fix the media symlinks
[08/01/2019 07:03:53][upgrade]: Running script /opt/seafile/seafile-server-7.0.3/upgrade/minor-upgrade.sh
[2019-08-01 07:03:53] Updating version stamp
-------------------------------------------------------------
This script would do the minor upgrade for you.
Press [ENTER] to contiune
-------------------------------------------------------------
------------------------------
migrating avatars ...
DONE
------------------------------
updating seafile-server-latest symbolic link to /opt/seafile/seafile-server-7.0.3 ...
DONE
------------------------------
[08/01/19 07:03:53] ../common/session.c(132): using config file /opt/seafile/conf/ccnet.conf
Starting seafile server, please wait ...
** Message: seafile-controller.c(718): No seafevents.
Seafile server started
Done.
**Starting seahub at port 8000 ...**
----------------------------------------
Successfully created seafile admin
----------------------------------------
Seahub is started
Done.
Aug 1 07:17:01 bae82335eca9 CRON[1424]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Aug 1 08:17:01 bae82335eca9 CRON[7165]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Aug 1 09:17:01 bae82335eca9 CRON[12905]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
[root@iz2ze78t84wkep9q8jsf4hz seafiles]#
root@2e4e4abd3a57:/opt/seafile# lsof -i -P | grep 80
nginx 29 root 6u IPv4 5662073 0t0 TCP *:80 (LISTEN)
seaf-serv 142 root 19u IPv4 5662174 0t0 TCP *:8082 (LISTEN)
python2.7 175 root 7u IPv4 5667847 0t0 TCP localhost:8000 (LISTEN)
python2.7 181 root 7u IPv4 5667847 0t0 TCP localhost:8000 (LISTEN)
python2.7 182 root 7u IPv4 5667847 0t0 TCP localhost:8000 (LISTEN)
1、80端口是nginx监听的，担任反向代理的功能。请求经由nginx再转给python的web server（监听8000），所以，你不需要将80改成8000。
2、127.0.0.1:8000仅监听本地loopback地址，根本无法响应外界的请求。这是网络方面的基础知识。
3、lsof、ss都是你的好朋友，要善于利用。
你可以试试单独在用docker下载一个centos，在里面部署，然后打包来用。我做了个可以使用。