最近机器迁移，需要备份文件，但各个机器间不能穿梭，即无法通过scp来传输文件，
在运维的建议下，选用了rsync作为传输的工具。
默认情况Ubuntu安装了rsync服务，但在/etc下没有配置文件，一般情况可以copy示例文件到/etc下。
配置无帐号登录的示例如下，需要主要高亮的部分。
[mail] comment = public archive path = /tmp/mail/ use chroot = no # max connections=10 lock file = /var/lock/rsyncd # the default for read only is yes... read only = no list = yes uid = service gid = admin # exclude = # exclude from = # include = # include from = # auth users = service # secrets file = /etc/rsyncd.secrets strict modes = no # hosts allow = # hosts deny = ignore errors = no ignore nonreadable = yes transfer logging = no # log format = %t: host %h (%a) %o %f (%l bytes). Total %b bytes. timeout = 600 refuse options = checksum dry-run dont compress = *.gz *.tgz *.zip *.z *.rpm *.deb *.iso *.bz2 *.tbz