问题：docker pull manifest unknown blob errors
原因：公司网络是代理模式，所以我的 docker 服务配置成proxy模式：
[root@localhost ~]# cat /usr/lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network.target firewalld.service [Service]
Type=notify
Environment="http_proxy=http://192.168.59.241:8888/" "https_proxy=https://192.168.59.241:8888/"
ExecStart=/usr/bin/dockerd --insecure-registry 172.19.15.95:4000
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process [Install]
WantedBy=multi-user.target
把配置文件中的 代理去掉：
Environment="http_proxy=http://192.168.59.241:8888/" "https_proxy=https://192.168.59.241:8888/"
[root@localhost ~]# cat /usr/lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network.target firewalld.service [Service]
Type=notify
ExecStart=/usr/bin/dockerd --insecure-registry 172.19.15.95:4000
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process [Install]
WantedBy=multi-user.target