Docker学习(7)------配置Docker使用Devicemapper
操作环境Centos7Docker version 17.03.0-ce, build 60ccb22操作步骤1.创建pv[root@localhost ~]# pvcreate /dev/sdc12.创建vg[root@localhost ~]# vgcreate docker /dev/sdc13.创建lv[roo
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操作环境
Centos7
Docker version 17.03.0-ce, build 60ccb22
操作步骤
docker devicemapper有两种配置模式loop-lvm和direct lvm,默认使用loop-lvm配置模式,但是在使用该模式的时候,通过docker info,信息提示 WARNING: Usage of loopback devices is strongly discouraged for production use. Use `--storage-opt dm.thinpooldev` to specify a custom block storage device,在生产环境中不推荐使用loop-lvm模式,推荐使用direct-lvm模式,下面就是direct-lvm模式的配置步骤。
1.创建pv
[root@localhost ~]# pvcreate /dev/sdc1
2.创建vg
[root@localhost ~]# vgcreate docker /dev/sdc1
3.创建lv
[root@localhost ~]#lvcreate --wipesignatures y -n thinpool docker -l 95%VG
[root@localhost ~]#lvcreate --wipesignatures y -n thinpoolmeta docker -l 1%VG
4.转换pool为thin pool
[root@localhost ~]lvconvert -y --zero n -c 512K --thinpool docker/thinpool --poolmetadata docker/thinpoolmeta
5.编辑针对docker/thinpool的profile文件如下
[root@localhost ~]# vi /etc/lvm/profile/docker-thinpool.profile
activation {
thin_pool_autoextend_threshold=80
thin_pool_autoextend_percent=20
}
[root@localhost ~]# lvchange --metadataprofile docker-thinpool docker/thinpool
[root@localhost ~]# lvs -o+seg_monitor
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert Monitor
home centos -wi-ao---- 141.62g
root centos -wi-ao---- 50.00g
swap centos -wi-ao---- 7.88g
thinpool docker twi-aot--- 950.00g 1.08 0.02 monitored
8.修改docker.service配置文件中的Execstart参数如下
ExecStart=/usr/bin/dockerd --storage-driver=devicemapper --storage-opt=dm.thinpooldev=/dev/mapper/docker-thinpool --storage-opt=dm.use_deferred_removal=true --storage-opt=dm.use_deferred_deletion=true
9.重启daemon以及docker
[root@localhost ~]# systemctl daemon-reload
[root@localhost ~]# systemctl restart docker
10.查看docker 信息
[root@localhost ~]# docker info
Containers: 4
Running: 1
Paused: 0
Stopped: 3
Images: 1
Server Version: 17.03.0-ce
Storage Driver: devicemapper
Pool Name: docker-thinpool
Pool Blocksize: 524.3 kB
Base Device Size: 118.1 GB
Backing Filesystem: xfs
Data file:
Metadata file:
Data Space Used: 10.97 GB
Data Space Total: 1.02 TB
Data Space Available: 1.009 TB
Metadata Space Used: 1.946 MB
Metadata Space Total: 10.73 GB
Metadata Space Available: 10.73 GB
Thin Pool Minimum Free Space: 102 GB
Udev Sync Supported: true
Deferred Removal Enabled: true
Deferred Deletion Enabled: true
Deferred Deleted Device Count: 0
Library Version: 1.02.135-RHEL7 (2016-11-16)
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host macvlan null overlay
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 977c511eda0925a723debdc94d09459af49d082a
runc version: a01dafd48bc1c7cc12bdb01206f9fea7dd6feb70
init version: 949e6fa
Security Options:
seccomp
Profile: default
Kernel Version: 3.10.0-514.10.2.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 8
Total Memory: 15.5 GiB
Name: localhost.localdomain
ID: OFSQ:L72F:BGO4:JQFT:66UZ:IJYF:RWRW:RYJF:O624:F3Z5:NNIE:HO3H
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
Experimental: false
Insecure Registries:
127.0.0.0/8
Registry Mirrors:
https://wghlmi3i.mirror.aliyuncs.com
Live Restore Enabled: false
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