Lsyncd 文件实时同步

Lsyncd 是一种轻量级的文件实时镜像解决方案，默认使用 rsync 实现

介绍

Lsyncd 通过文件系统事件接口（inotify 或 fsevents）来监视本地文件和目录的更改。

安装

源服务器

• Lsyncd 2.2.1 requires rsync >= 3.1

# CentOS/Redhat
yum install lsyncd rsync

# Ubuntu
apt install lsyncd rsync

源服务器

apt install rsync

使用示例

采用 rsyncssh 模式

• 源与目标服务器配置 ssh 免密登录

# 源服务器
ssh-keygen -t ed25519 -b 4096
ssh-copy-id root@<target-host-ip>
ssh root@<target-host-ip>

• 配置 lsyncd，参考，一些配置文件参考：

$ cat << EOF > /etc/lsyncd.conf
settings {
    logfile = "/var/log/lsyncd.log",
    statusFile = "/var/log/lsyncd-status.log",
    insist = true,
    inotifyMode = "Modify",
    statusInterval = 20
}

sync {
   default.rsyncssh,
   source="/data/",
   host="172.17.0.2",
   excludeFrom="/etc/lsyncd.exclude",
   targetdir="/data",
   maxDelays = 5,
   delay = 0,
   rsync = {
        archive = true,
        compress = false,
        whole_file = false
   },
   ssh = {
     port = 22
   }
}
EOF

• 创建排除的文件配置 /etc/lsyncd.exclude

$ cat << EOF > /etc/lsyncd.exclude
*.log
EOF

• 检测配置文件

lsyncd -nodaemon /etc/lsyncd.conf

• 启动服务

systemctl start lsyncd.service
lsyncd /etc/lsyncd.conf

• 查看状态并测试

  • 日志：/var/log/lsyncd.log
  • 测试：/var/log/lsyncd-status.log

• 配置 /etc/rsyncd.conf

uid = root     # 表示同步的文件所属用户
gid = root     # 表示同步的文件所属用户组
use chroot = yes      # 安全相关，表示在同步时，是否将同步目录转为根目录
max connections=0     # 允许客户端的最大连接数，0表示不限制
log file=/var/log/rsyncd/rsyncd.log
pid file=/var/run/rsyncd.pid
lock file=/var/run/rsyncd.lock

[backup]
path = /var/tmp/
read only = no
list = yes
# auth users = rsyncuser
# secrets file = /etc/rsync.pas

• 密码文件可选

#  密码文件
$ cat /etc/images.pas
rsyncuser:123456

# 修改权限
chmod 600 /etc/images.pas

• 启动

systemctl start rsync

配置示例

settings {
    logfile = "/var/log/lsyncd.log",
    statusFile = "/var/log/lsyncd-status.log",
    insist = true,
    inotifyMode = "Modify",
    statusInterval = 20
}

# 本地目录同步rsync模式
sync {
     default.rsync,
     source = "/tmp/src",
     target = "/tmp/dest1",
     excludeFrom = "/etc/rsyncd.d/rsync_exclude.lst",
     rsync = {
             binary = "/usr/bin/rsync",
             archive = true,
             compress = true,
             bwlimit = 2000
             }
     }
# 远程目录同步rsync模式 + rsyncd daemon
sync {
     default.rsync,
     source = "/tmp/src",
     target = "syncuser@172.17.0.2::module1",
     delete="running",
     exclude = { ".*", ".tmp" },
     delay = 30,
     init = false,
     rsync = {
             binary = "/usr/bin/rsync",
             archive = true,
             compress = true,
             verbose = true,
             password_file = "/etc/rsyncd.d/rsync.pwd",
             _extra = {"--bwlimit=200"}
             }
     }

# 远程目录同步rsync模式 + ssh shell
sync {
     default.rsync,
     source = "/tmp/src",
     target = "172.17.0.2:/tmp/dest",
     # target = "root@172.17.0.2:/remote/dest",
     # 上面target注意如果是普通用户必须拥有写权限
     maxDelays = 5,
     delay = 30,
     # init = true,
     rsync = {
             binary = "/usr/bin/rsync",
             archive = true,
             compress = true,
             bwlimit = 2000
             # rsh = "/usr/bin/ssh -p 22 -o StrictHostKeyChecking=no"
             # 如果要指定其它端口请用上面的rsh
     }
}

# 远程目录同步rsync模式 + rsyncssh效果与上面相同
sync {
     default.rsyncssh,
     source = "/tmp/src2",
     host = "172.17.0.2",
     targetdir = "/remote/dir",
     excludeFrom = "/etc/rsyncd.d/rsync_exclude.lst",
     # maxDelays = 5,
     delay = 0,
     # init = false,
     rsync = {
             binary = "/usr/bin/rsync",
             archive = true,
             compress = true,
             verbose = true,
             _extra = {"--bwlimit=2000"},
     },
     ssh = {
            port = 1234
     }
}