錯誤：
[ERROR] Failed to execute goal com.spotify:docker-maven-plugin:1.2.1:build (build-image) on project freemarker-page-demo: Exception caught: Get https://registry-1.docker.io/v2/library/java8/manifests/latest: Get https://auth.docker.io/token?scope=repository%3Alibrary%2Fjava8%3Apull&service=registry.docker.io: net/http: TLS handshake timeout -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
或
Get https://registry-1.docker.io/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
解決方案：更換國內鏡像服務器。
換了好幾台，科大的，還有一些其他的，都是不行。決定試用鏡像加速器。
登錄阿里雲控制台，產品中搜索鏡像，選擇鏡像加速器，復制加速器地址。
將加速器地址，更新到/etc/docker/daemon.json中
{ "registry-mirrors": ["https://jvqgqnis.mirror.aliyuncs.com"] }
居然又報下面錯誤：
curl https://registry-1.docker.io/v2/，發現需要認證。看來是auth.docker.io這個域名超時了。
Get https://registry-1.docker.io/v2/library/java/manifests/8: Get https://auth.docker.io/token?account=zhouyu629&scope=repository%3Alibrary%2Fjava%3Apull&service=registry.docker.io: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
試試docker login
[root@localhost fpage]# docker login Authenticating with existing credentials... Login did not succeed, error: Error response from daemon: Get https://registry-1.docker.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers) Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one. Username (zhouyu629): zhouyu629 Password: Error response from daemon: Get https://registry-1.docker.io/v2/: Get https://auth.docker.io/token?account=zhouyu629&client_id=docker&offline_token=true&service=registry.docker.io: net/http: request canceled (Client.Timeout exceeded while awaiting headers) (Client.Timeout exceeded while awaiting headers)
果然不行。試用用chrome瀏覽auth這個域名，果然一會能打開，刷新一下又不行了，看來是不穩定。
白天在公司還行，家里網絡不行，試了host和resovle，都不行。明天再到公司試下。
20200310
在公司網絡下，果然可以了。看來家里網絡還是有問題。
網絡問題解決了，又出現一個新問題：no space left
docker info: Storage Driver: overlay2
再 df -kh，看了下overlay空間不足
文件系統 容量 已用 可用 已用% 掛載點 devtmpfs 903M 0 903M 0% /dev tmpfs 919M 0 919M 0% /dev/shm tmpfs 919M 9.1M 910M 1% /run tmpfs 919M 0 919M 0% /sys/fs/cgroup /dev/mapper/centos-root 6.2G 5.7G 521M 92% / /dev/sda4 19G 81M 18G 1% /home /dev/sda1 1014M 219M 796M 22% /boot tmpfs 184M 0 184M 0% /run/user/0 overlay 6.2G 5.7G 521M 92% /var/lib/docker/overlay2/471243d367850d452e94d3e7740c7026a2f0320af68b402fe6a28705d63536ff/merged tmpfs 184M 0 184M 0% /run/user/1000
把/var/lib/docker 移到home，再做個快捷方式鏈接過去。
[root@localhost /]# service docker stop Redirecting to /bin/systemctl stop docker.service [root@localhost /]# mv /var/lib/docker /home/ [root@localhost /]# ln -s /home/docker/ /var/lib/ [root@localhost /]# service docker start Redirecting to /bin/systemctl start docker.service [root@localhost /]# df -kh 文件系統 容量 已用 可用 已用% 掛載點 devtmpfs 903M 0 903M 0% /dev tmpfs 919M 0 919M 0% /dev/shm tmpfs 919M 9.1M 910M 1% /run tmpfs 919M 0 919M 0% /sys/fs/cgroup /dev/mapper/centos-root 6.2G 5.6G 655M 90% / /dev/sda4 19G 215M 18G 2% /home /dev/sda1 1014M 219M 796M 22% /boot tmpfs 184M 0 184M 0% /run/user/0 tmpfs 184M 0 184M 0% /run/user/1000 overlay 19G 215M 18G 2% /home/docker/overlay2/471243d367850d452e94d3e7740c7026a2f0320af68b402fe6a28705d63536ff/merged
再 docker build終於成功了：
[root@localhost fpage]# docker build -t boot-docker . Sending build context to Docker daemon 12.8kB Step 1/6 : FROM java:8 8: Pulling from library/java 5040bd298390: Pull complete fce5728aad85: Pull complete 76610ec20bf5: Pull complete 60170fec2151: Pull complete e98f73de8f0d: Pull complete 11f7af24ed9c: Pull complete 49e2d6393f32: Pull complete bb9cdec9c7f3: Pull complete Digest: sha256:c1ff613e8ba25833d2e1940da0940c3824f03f802c449f3d1815a66b7f8c0e9d Status: Downloaded newer image for java:8 ---> d23bdf5b1b1b Step 2/6 : VOLUME /home ---> Running in 567eb55489ee Removing intermediate container 567eb55489ee ---> 2697773d05bd Step 3/6 : COPY freemarker-page-demo-1.0-SNAPSHOT.jar page.jar ---> bd0e15853a86 Step 4/6 : RUN bash -c "touch /page.jar" ---> Running in 9ca6ad3a6eca Removing intermediate container 9ca6ad3a6eca ---> fbd2d53d16ba Step 5/6 : EXPOSE 8080 ---> Running in 8a4d61f14ffb Removing intermediate container 8a4d61f14ffb ---> 7a221e5fb012 Step 6/6 : ENTRYPOINT ["java","-jar","page.jar","--server.port=8080","> /home/log/page.log"] ---> Running in 28795c5e40dc Removing intermediate container 28795c5e40dc ---> d83747d5a950 Successfully built d83747d5a950 Successfully tagged boot-docker:latest