使用 cgroups 限制 MySQL Enterprise Backup 对资源的占用
今天我遇到一个问题，MySQL企业版备份引起I/O子系统负载过大，应用响应缓慢，导致系统不可用。所以我想限制mysqlbackup的进程，使
今天我遇到一个问题，MySQL企业版备份引起I/O子系统负载过大，应用响应缓慢，导致系统不可用。所以我想限制mysqlbackup的进程，使它不会引起更多的问题。
mysqlbackup命令里面有读，，写和进程数的设置。默认是1个读，1个写和5个线程。因为我用的是默认设置，所以还是没有必要去调整了。
使用ionice工具没法工作，因为它需要CFG I/O调度器。
我在这篇文章里找到一个方法。 它使用的是linux的cgroups。之前，在三台中有一台服务器使用的是非常慢的CPU的情况下，我使用过cgroups来测试一个galera的安装工作。
# mkdir /cgroup/blkio
# mount -t cgroup -o blkio non /cgroup/blkio
# cgcreate -g blkio:/mysqlbackup
# ls -lh /dev/mapper/vgdb01-lvdb01
lrwxrwxrwx 1 root root 7 Sep 26 14:22 /dev/mapper/vgdb01-lvdb01 -> ../dm-2
# ls -lh /dev/dm-2
brw-rw---- 1 root disk 253, 2 Sep 26 14:22 /dev/dm-2
# cgset -r blkio.throttle.read_iops_device="253:2 20" mysqlbackup
# cgset -r blkio.throttle.write_iops_device="253:2 20" mysqlbackup
# echo $$ > /cgroup/blkio/mysqlbackup/tasks
# cat /proc/$$/cgroup
1:blkio:/mysqlbackup
# mysqlbackup --user=root --password=xxxxxx --with-timestamp --backup-dir=/data/backup backup
和我期待的完全一样，这种方式工作的很好。读和写操作都被限制在 20 iops.
后来发现是存储系统的问题，所以我没有在生产环境使用这种方法，但是我希望这会帮上其他人忙。或许在其他问题下也是有用的。
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