Got permission denied while trying to connect to the Docker daemon socket at unix

[INFO] Scanning for projects...
[WARNING] 
[WARNING] Some problems were encountered while building the effective model for com.springboot:test:jar:0.0.1-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing. @ line 168, column 21
[WARNING] 'build.plugins.plugin.version' for org.springframework.boot:spring-boot-maven-plugin is missing. @ line 157, column 21
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
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[INFO] ------------------------< com.springboot:test >-------------------------
[INFO] Building test 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
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[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ test ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 2 resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ test ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 6 source files to /home/gitlab-runner/builds/f7db5640/0/mygroup/springboot/target/classes
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[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ test ---
[INFO] Not copying test resources
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[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ test ---
[INFO] Not compiling test sources
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[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ test ---
[INFO] Tests are skipped.
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[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ test ---
[INFO] Building jar: /home/gitlab-runner/builds/f7db5640/0/mygroup/springboot/target/boot.jar
[INFO] 
[INFO] --- spring-boot-maven-plugin:2.1.2.RELEASE:repackage (default) @ test ---
[INFO] Replacing main artifact with repackaged archive
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[INFO] BUILD SUCCESS
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[INFO] Total time:  4.552 s
[INFO] Finished at: 2019-01-25T10:42:18+08:00
[INFO] ------------------------------------------------------------------------
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.35/build?buildargs=%7B%7D&cachefrom=%5B%5D&cgroupparent=&cpuperiod=0&cpuquota=0&cpusetcpus=&cpusetmems=&cpushares=0&dockerfile=Dockerfile&labels=%7B%7D&memory=0&memswap=0&networkmode=default&rm=1&session=6b5bacd4f91d9a6f49100c8fd767fb476ed89138879b694efe660b3f38cbf0e4&shmsize=0&t=10.10.111.117%3A31409%2Fspringboot&target=&ulimits=null: dial unix /var/run/docker.sock: connect: permission denied
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.35/images/10.10.111.117:31409/springboot/push?tag=: dial unix /var/run/docker.sock: connect: permission denied

解决方法：

执行时处于非 root 权限，命令前面需要加上 sudo