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devicemapper_environmental_preparation_zh.md

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devicemapper的环境准备

  1. 安装lvm逻辑卷管理包：
# apt-get install lvm2
  1. 查看当前主机上可用块设备：
# lsblk
  1. 执行isulad_lvm_conf.sh配置isulad-thinpool:
#sh -x isulad_lvm_conf.sh sda8

isulad_lvm_conf.sh中的内容如下：

#!/bin/bash
current_dir=$(cd `dirname $0` && pwd)
disk="/dev/$1"

rm -rf /var/lib/isulad/*
dmsetup remove_all
lvremove -f isulad/thinpool
lvremove -f isulad/thinpoolmeta
vgremove -f isulad
pvremove -f $disk
mount | grep $disk | grep /var/lib/isulad
if [ x"$?" == x"0" ];then
    umount /var/lib/isulad
fi
echo y | mkfs.ext4 $disk

touch /etc/lvm/profile/isulad-thinpool.profile
cat > /etc/lvm/profile/isulad-thinpool.profile <<EOF
activation {
thin_pool_autoextend_threshold=80
thin_pool_autoextend_percent=20
}
EOF
pvcreate -y $disk
vgcreate isulad $disk
echo y | lvcreate --wipesignatures y -n thinpool isulad -l 80%VG
echo y | lvcreate --wipesignatures y -n thinpoolmeta isulad -l 1%VG
lvconvert -y --zero n -c 512K --thinpool isulad/thinpool --poolmetadata isulad/thinpoolmeta
lvchange --metadataprofile isulad-thinpool isulad/thinpool
lvs -o+seg_monitor
exit 0

  1. 配置isulad

    在/etc/isulad/daemon.json中配置storage-driver和storage-opts：

    "storage-driver": "devicemapper",
"storage-opts": [
        "dm.thinpooldev=/dev/mapper/isulad-thinpool",
        "dm.fs=ext4",
        "dm.min_free_space=10%"
 ],

  2. 重启isulad。

    $ sudo systemctl restart isulad