linux系统上docker的安装、基本操作即出现的问题

首先问题描述：在对局域网内进行docker pull时提示： 

Error response from daemon: invalid registry endpoint https://192.168.15.108:5000/v0/: unable to ping registry endpoint https://192.168.15.108:5000/v0/
v2 ping attempt failed with error: Get https://192.168.15.108:5000/v2/: tls: oversized record received with length 20527
 v1 ping attempt failed with error: Get https://192.168.15.108:5000/v1/_ping: tls: oversized record received with length 20527. If this private registry supports only HTTP or HTTPS with an unknown CA certificate, please add `--insecure-registry 192.168.15.108:5000` to the daemon's arguments. In the case of HTTPS, if you have access to the registry's CA certificate, no need for the flag; simply place the CA certificate at /etc/docker/certs.d/192.168.15.108:5000/ca.crt

原因是：在通过http方式进行pull时，无法使用证书导致。 
解决办法:<1>vi  /etc/sysconfig/docker（有的系统会在 /etc/default/docker下，据有少些人说安装完后这个配置文件跑到了/usr/lib下，不过都无所谓）
                <2>将第四行OPTIONS='--selinux-enabled' 注释掉（此举将省去修改/etc/sysconfig/selinux中第七行的SELINUX=enforcing为disabled）
                <3> 将低23行#INSECURE_REGISTRY='--insecure-registry' 的#号去掉，并在registry后添加上服务器指定域名或者Ip+端口号，例如：
                            INSECURE_REGISTRY='--insecure-registry 192.168.15.108:5000'
                <4>wq保存退出， service docker restart 即可解决。

docker安装（centos）：
            确认好yum源可用，执行 yum install docker即可  （测试发现yum install docker-io效果一样 ， -y的话是安装过程中出现的提示全部默认yes）

docker启动：
方式一： 手动启动 。直接执行/usr/bin/docker -d --insecure-registry 192.168.15.108:5000
（注意我这里是为了从局域网服务器上pull一个镜像才执行的--insecure-registry 192.168.15.108:5000，否则会报开头出现的错误， 当然你也可以执行类似于/usr/bin/docker -d --selinux-enabled直接从docker官网选择已有的镜像自己去Pull. 再当然，此时就需要一些类似于docker search的操作，以便选择更为精确的镜像版本，具体参考这个）

方式二：通过一开头出现问题时，修改的配置文件，执行service docker start ，来启动服务。

docker确认启动： ps -ef | grep docker时，能够看到 
[root@localhost ming]# ps -ef |grep docker 
root     22683     1  0 14:01 ?        00:00:00 /usr/bin/docker -d --selinux-enabled
root     22825 13681  0 14:06 pts/0    00:00:00 grep --color=auto docker

执行docker info

[root@localhost ming]# docker info
Containers: 0
Images: 12
Storage Driver: devicemapper
 Pool Name: docker-253:1-5918542-pool
 Pool Blocksize: 65.54 kB
 Backing Filesystem: xfs
 Data file: /dev/loop0
 Metadata file: /dev/loop1
 Data Space Used: 823.5 MB
 Data Space Total: 107.4 GB
 Data Space Available: 40.81 GB
 Metadata Space Used: 1.315 MB
 Metadata Space Total: 2.147 GB
 Metadata Space Available: 2.146 GB
 Udev Sync Supported: true
 Deferred Removal Enabled: false
 Data loop file: /var/lib/docker/devicemapper/devicemapper/data
 Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
 Library Version: 1.02.93-RHEL7 (2015-01-28)
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 3.10.0-123.el7.x86_64
Operating System: CentOS Linux 7 (Core)
CPUs: 2
Total Memory: 1.791 GiB
Name: localhost.localdomain
ID: YZPN:3IYO:WQPB:53ID:2QB2:O2RA:LMMP:XC2N:A47O:ENUB:WUZD:DPQS

执行docker version 

[root@localhost ming]# docker version
Client version: 1.7.1
Client API version: 1.19
Package Version (client): docker-1.7.1-115.el7.x86_64
Go version (client): go1.4.2
Git commit (client): 446ad9b/1.7.1
OS/Arch (client): linux/amd64
Server version: 1.7.1
Server API version: 1.19
Package Version (server): docker-1.7.1-115.el7.x86_64
Go version (server): go1.4.2
Git commit (server): 446ad9b/1.7.1
OS/Arch (server): linux/amd64

此时我们就可以先从本地pull一个镜像文件进行各种操作了
具体的各种pull方式 ，参考 />