window7安装docker toolbox 的小伙伴看过来，如果你也启动mongodb 不成功请看下面：
1、下载：$docker pull mongo
2、查看：$docker images （会看到自己下载的镜像）
3、去创建一个docker卷 ：$ docker volume create mongodata
4、查看一下你的卷路径（确保创建成功）：$ docker volume inspect mongodata
如果成功会出现以下内容：
[
    {
        "CreatedAt": "2019-02-28T09:12:08Z",
        "Driver": "local",
        "Labels": {},
        "Mountpoint": "/mnt/sda1/var/lib/docker/volumes/mongodata/_data",
        "Name": "mongodata",
        "Options": {},
        "Scope": "local"
    }
]
5、这个时候就可以运行啦$ docker run --name mongo -p 27017:27017 -v mongodata:/data/db -e MONGO_INITDB_ROOT_USERNAME=root -e MONGO_INITDB_ROOT_PASSWORD=root -d mongo
结果：
1500417691d8f0ea71c2ddbe589f27e2b38cbf92e5fcece6683e5bf47e8cdf0c
6、确认一下是否启动：$ docker ps
结果：
CONTAINER ID IMAGE COMMAND CREATED
     STATUS PORTS NAMES
1500417691d8 mongo "docker-entrypoint.s" 10 minutes ago
    Up 10 minutes 0.0.0.0:27017->27017/tcp mongo

如果是这样那你就成功了！

但是我在一开始的时候第5步中写的并不是root 而是 admin 一直不成功（@老师有没有解释）
例如：
docker run --name mongo -p 27017:27017 -v mongodata:data/db -e MONGO_INITDB
OOT_USERNAME=admin -e MONGO_INITDB_ROOT_PASSWORD=admin -d mongo
结果：
\Program Files\Docker Toolbox\docker.exe: Error response from daemon: invalid
lume specification: 'mongodata:data/db': invalid mount config for type "volume
 invalid mount path: 'data/db' mount path must be absolute.
e 'C:\Program Files\Docker Toolbox\docker.exe run --help'.

在这一节我遇到了以下两个问题:
1. win10 家庭版如何安装并运行 Docker?
解决: 参考 https://www.jianshu.com/p/1329954aa329 可以完全解决.

2. 运行 mongo 镜像时无法启动, 用 docker ps -all 查看运行状态为 Exited (14)
解决: 在老师给的命令中去掉 -v ~/dockerdata/mongo:/data/db, 重新运行命令 (运行前要用docker container rm mongo 命令来删除之前创建的容器). 这一点在官方文档中有说明 (https://hub.docker.com/_/mongo).

docker: command not found解决方案 一劳永逸：

cd ~/
touch .bash_profile
open .bash_profile
打开文件后追加以下内容即可
PATH=$PATH:/usr/local/bin

Docker pull mongo 运行
docker run --name mongo -p 27017:27017 -v mongo:/data/db -e MONGO_INITDB_ROOT_USERNAME=root -e MONGO_INITDB_ROOT_PASSWORD=root -d mongo 命令 发现mongo 无法正常启动，用dockers logs mongo-1 查看日志 发现是
 Operation not permitted
2019-09-07T02:48:38.054+0000 W STORAGE [initandlisten] Failed to start up WiredTiger under any compatibility version.
2019-09-07T02:48:38.054+0000 F STORAGE [initandlisten] Reason: 1: Operation not permitted

参考文章：https://blog.csdn.net/qq506930427/article/details/99658808
用命令创建volumn 之后再运行 ，成功启动

docker 宿主机：centos 7
运行镜像：docker run --name docker_mongodb -p 27017:27017 -v ~/docker-data/mongo:/data/db -e MONGO_INITDB_ROOT_USERNAME=admin -e MONGO_INITDB_ROOT_PASSWORD=admin -d mongo
登录到容器：docker exec -it docker_mongodb bash
连接：mongo -u admin -p admin
ERROR LOGS:
        2019-09-05T04:39:24.227+0000 I ACCESS [conn6] Supported SASL mechanisms requested for unknown user 'admin@admin'
2019-09-05T04:39:24.228+0000 I ACCESS [conn6] SASL SCRAM-SHA-1 authentication failed for admin on admin from client 127.0.0.1:49280 ; UserNotFound: Could not find user "admin" for db "admin"
2019-09-05T04:39:24.236+0000 I NETWORK [conn6] end connection 127.0.0.1:49280 (0 connections now open)
连接：mongo可以登录
这是为什么呢？

com.mongodb.MongoSocketOpenException: Exception opening socket
    at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:67) ~[mongodb-driver-core-3.8.2.jar:na]
    at com.mongodb.internal.connection.InternalStreamConnection.open(InternalStreamConnection.java:126) ~[mongodb-driver-core-3.8.2.jar:na]
    at com.mongodb.internal.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:117) ~[mongodb-driver-core-3.8.2.jar:na]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_161]
Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_161]
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_161]
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_161]
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_161]
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_161]
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_161]
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_161]
    at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_161]
    at com.mongodb.internal.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:64) ~[mongodb-driver-core-3.8.2.jar:na]
    at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:62) ~[mongodb-driver-core-3.8.2.jar:na]
    ... 3 common frames omitted
老师，报的这个错，是端口映射的原因吗