OCI runtime create failed: conta

jenkins上构建任务，docker in docker 执行docker build报错:

 OCI runtime create failed: container_linux.go:345: starting container process caused "process_linux.go:297: getting the final child's pid from pipe caused \"EOF\"": unknown

设置内核参数：

sysctl -w user.max_user_namespaces=15000 

记录了允许创建的user namespace数量，我的centos7默认是0修改之后就好了。