当我执行docker exec -it containerID bash但容器已启动时出错。容器的mysql可以访问。在同一台计算机（linux / centos7）上，另外两个容器启动并运行良好。
rpc error: code = 13 desc = invalid header field value "oci runtime error: exec failed: container_linux.go:247: starting container process caused \"process_linux.go:75: starting setns process caused \\\"fork/exec /proc/self/exe: no such file or directory\\\"\"\n"。
docker守护程序日志：（ps：磁盘存储容量没问题）
Sep 05 14:54:06 localhost.localdomain dockerd-current[2556]: time="2017-09-05T14:54:06.865115768+08:00" level=info msg="{Action=exec, Username=root, LoginUID=0, PID=27904}"
Sep 05 14:54:06 localhost.localdomain dockerd-current[2556]: time="2017-09-05T14:54:06.866161932+08:00" level=info msg="{Action=start, Username=root, LoginUID=0, PID=27904}"
Sep 05 14:54:06 localhost.localdomain dockerd-current[2556]: time="2017-09-05T14:54:06.866937477+08:00" level=info msg="{Action=resize, Username=root, LoginUID=0, PID=27904}"
Sep 05 14:54:06 localhost.localdomain dockerd-current[2556]: time="2017-09-05T14:54:06.918521262+08:00" level=error msg="Error running exec in container: rpc error: code = 13 desc = invalid header field value \"oci runtime error: exec f
Sep 05 14:54:06 localhost.localdomain dockerd-current[2556]: time="2017-09-05T14:54:06.918886936+08:00" level=error msg="Handler for POST /v1.24/exec/58ec220389fc476fc828523a62b8fb577815bdb6da85f77842f634091deea45b/resize returned error
Sep 05 14:54:07 localhost.localdomain dockerd-current[2556]: [282B blob data]
码头信息： [root @ localhost~] #docker info
Containers: 22
Running: 18
Paused: 0
Stopped: 4
Images: 18
Server Version: 1.12.6
Storage Driver: devicemapper
Pool Name: docker-253:0-134909774-pool
Pool Blocksize: 65.54 kB
Base Device Size: 10.74 GB
Backing Filesystem: xfs
Data file: /dev/loop0
Metadata file: /dev/loop1
Data Space Used: 37.65 GB
Data Space Total: 107.4 GB
Data Space Available: 8.659 GB
Metadata Space Used: 27.87 MB
Metadata Space Total: 2.147 GB
Metadata Space Available: 2.12 GB
Thin Pool Minimum Free Space: 10.74 GB
Udev Sync Supported: true
Deferred Removal Enabled: false
Deferred Deletion Enabled: false
Deferred Deleted Device Count: 0
Data loop file: /var/lib/docker/devicemapper/devicemapper/data
WARNING: Usage of loopback devices is strongly discouraged for production use. Use `--storage-opt dm.thinpooldev` to specify a custom block storage device.
Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
Library Version: 1.02.135-RHEL7 (2016-11-16)
Logging Driver: journald
Cgroup Driver: systemd
Plugins:
Volume: local
Network: host null bridge overlay
Swarm: inactive
Runtimes: runc docker-runc
Default Runtime: docker-runc
Security Options: seccomp
Kernel Version: 3.10.0-514.26.2.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
Number of Docker Hooks: 2
CPUs: 24
Total Memory: 31.25 GiB
Name: localhost.localdomain
ID: I7D3:42F2:4C4T:AKKR:WPKR:TYQQ:ID4K:DWV7:WHZX:W64K:U3D6:O6IF
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled
Insecure Registries:
127.0.0.0/8
Registries: docker.io (secure)
docker logs container-id没有错误。