当从Docker Hub拉取Redis镜像后，发现镜像内没有配置文件。尝试通过挂载宿主机目录并指定启动命令来运行容器，但并未自动生成配置文件。解决方案是确定Redis版本为5.0.8，然后在宿主机上通过yum安装相同版本的Redis，手动复制redis.conf配置文件到挂载目录，从而成功启动Redis服务。
拉取的redis镜像是没有配置文件的。按照网上的解决方式启动，指定启动目录：
docker run -p 6379:9911 --name rd1 -v /data/redis/rd1/conf/redis.conf:/etc/redis.conf -v /data/redis/rd1/data:/data -d redis redis-server /etc/redis.conf --appendonly yes
原以为在宿主机上的/data/redis/rd1/conf/文件夹下会自动生成redis.conf配置文件，可是结果是生成了redis.conf。
看来要自己复制一份redis.conf文件。
先查看下docker pull对应的redis版本是5.0.8
[root@128 ~]# docker exec -it rd1 /bin/bash
root@58f8d962581b:/data# redis-cli --version
redis-cli 5.0.8
在宿主机中通过yum安装redis 5.0.8
[root@128 yum_redis_5.0.8]# wget http://download.redis.io/releases/redis-5.0.8.tar.gz
--2020-03-24 19:21:54-- http://download.redis.io/releases/redis-5.0.8.tar.gz
Resolving download.redis.io (download.redis.io)... 109.74.203.151
Connecting to download.redis.io (download.redis.io)|109.74.203.151|:80... connected.
HTTP request sent, awaiting response... 302 Found
Location: http://211.143.146.233:81/2Q2W150913379F9670F5F89739D36E2810DD4AB2AFB1_unknown_806833F0FD9E2BA71F7D33D228D0412FCC8AD15D_6/download.redis.io/releases/redis-5.0.8.tar.gz [following]
--2020-03-24 19:21:54-- http://211.143.146.233:81/2Q2W150913379F9670F5F89739D36E2810DD4AB2AFB1_unknown_806833F0FD9E2BA71F7D33D228D0412FCC8AD15D_6/download.redis.io/releases/redis-5.0.8.tar.gz
Connecting to 211.143.146.233:81... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1985757 (1.9M) [application/x-gzip]
Saving to: ‘redis-5.0.8.tar.gz’
100%[=======================================================================================================================================================================>] 1,985,757 1.12MB/s in 1.7s
2020-03-24 19:21:56 (1.12 MB/s) - ‘redis-5.0.8.tar.gz’ saved [1985757/1985757]
[root@128 yum_redis_5.0.8]# ls
redis-5.0.8.tar.gz
[root@128 yum_redis_5.0.8]# tar xzf redis-5.0.8.tar.gz
[root@128 yum_redis_5.0.8]# cd redis-5.0.8
[root@128 redis-5.0.8]# ls
00-RELEASENOTES COPYING Makefile redis.conf runtest-moduleapi src
BUGS deps MANIFESTO runtest runtest-sentinel tests
CONTRIBUTING INSTALL README.md runtest-cluster sentinel.conf utils
[root@128 redis-5.0.8]# make
再把redis.conf复制到/data/redis/rd1/conf文件夹下就好使了
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