修改docker中运行程序的配置参数（keycloak修改配置演示）

首次在docker中创建 容器时，命令如下，可以不指定start-dev后面的参数

（指定参数太多？可以使用dockerfile文件，用docker build来构建容器，参考（更多参数也参考该链接）：https://www.keycloak.org/server/containers）

这里使用8081主机对外端口,8080为docker内部端口
docker run -d -p 8081:8080 -e KEYCLOAK_ADMIN=admin -e KEYCLOAK_ADMIN_PASSWORD=Adm@kfk -e KEYCLOAK_ENABLE_TLS=false quay.io/keycloak/keycloak:20.0.1 start-dev --db mysql --db-url-host rm-wz90f7ut8lvxa3771zo.mysql.rds.aliyuncs.com --db-url-port 3306 --db-username kcuser --db-password kcuser@keycloak#1128 --db-url-database keycloak

命令成功后，创建了容器，这里容器ID是1c50f818905c

下面是修改容器中的配置文件，以后只需要启动和停止容器。

1）找到keycloak的容器ID，这里是1c50f818905c,可以看到在目录opt下

[root@iZwz97yqubb71vyxhuskfwZ ~]# docker ps
CONTAINER ID        IMAGE                              COMMAND                  CREATED             STATUS              PORTS                                  
1c50f818905c        quay.io/keycloak/keycloak:20.0.1   "/opt/keycloak/bin/k…"   14 hours ago        Up 14 hours         8443/tcp, 0.0.0.0:8081->8080/tcp

 2）进入容器命令，在容器中查看配置文件目录是/opt/keycloak/conf/keycloak.conf

docker exec -it 1c50f818905c  /bin/bash

3）将容器内配置文件复制到本机tmp目录下，cp '容器ID'

docker cp '1c50f818905c':/opt/keycloak/conf/keycloak.conf  /tmp

4）在本机tmp目录下修改keycloak.conf文件保存

# The database vendor.
db=mysql

# The username of the database user.
db-username=kcuser

# The password of the database user.
db-password=kcuser@keycloak#1128

db-url-host=rm-wz90f7ut8lvxa3771zo.mysql.rds.aliyuncs.com
db-url-port=3306
db-url-database=keycloak

# The full database JDBC URL. If not provided, a default URL is set based on the selected database vendor.
#db-url=jdbc:postgresql://localhost/keycloak

# Observability

# If the server should expose healthcheck endpoints.
#health-enabled=true

# If the server should expose metrics endpoints.
#metrics-enabled=true

# HTTP

# The file path to a server certificate or certificate chain in PEM format.
#https-certificate-file=${kc.home.dir}conf/server.crt.pem

# The file path to a private key in PEM format.
#https-certificate-key-file=${kc.home.dir}conf/server.key.pem

# The proxy address forwarding mode if the server is behind a reverse proxy.
#proxy=reencrypt

# Do not attach route to cookies and rely on the session affinity capabilities from reverse proxy
#spi-sticky-session-encoder-infinispan-should-attach-route=false

# Hostname for the Keycloak server.
#hostname=myhostname

5）保存后再替换容器中的keycloak/conf文件

docker cp /tmp/keycloak.conf  '1c50f818905c':/opt/keycloak/conf/

6) 停止再启动容器

docker stop 1c50f818905c
docker start 1c50f818905c