RexCommandsRun 执行一个远程命令:
使用这个模块 你可以运行一个命令:
task "ppm", group=>"myservers", sub {
my $output = run "pwd;ls -l";
say $output;
};
[root@node01 Rex]# rex ppm
[2017-05-01 11:52:46] INFO - Running task ppm on 192.168.137.3
/root
导出的函数:
这个格式 会执行 $command 使用给定的参数$arguments.
参数必须是一个数组引用,参数
run($command_description, command => $command, %options)
run($command_description, command => $command, %options)
此函数会执行给定的命令和返回输出,在标量上下文 它返回原始输出,
在一个列表上下文 他返回列表输出 命令的退出值是存在$?变量
task "uptime", group=>"myservers", sub {
say run "uptime";
run "uptime", sub {
my ($stdout, $stderr) = @_;
my $server = Rex::get_current_connection()->{server};
say "[$server] $stdout
";
};
print "---------------
";
print $?;
print "---------------
";
};
[root@node01 Rex]# rex uptime
[2017-05-01 12:00:28] INFO - Running task uptime on 192.168.137.3
03:02:48 up 2 days, 23:30, 2 users, load average: 0.00, 0.00, 0.00
[192.168.137.3] 03:02:48 up 2 days, 23:30, 2 users, load average: 0.00, 0.00, 0.00
---------------
0---------------
[2017-05-01 12:00:39] INFO - All tasks successful on all hosts
task "uptime", group=>"myservers", sub {
say run "uptime";
run "xx", sub {
my ($stdout, $stderr) = @_;
my $server = Rex::get_current_connection()->{server};
say "[$server] $stdout
";
};
print "---------------
";
print $?;
print "---------------
";
};
[root@node01 Rex]# rex uptime
[2017-05-01 12:01:15] INFO - Running task uptime on 192.168.137.3
03:03:35 up 2 days, 23:30, 2 users, load average: 0.00, 0.00, 0.00
[192.168.137.3]
---------------
127---------------
[2017-05-01 12:01:26] INFO - All tasks successful on all hosts
例子：
如果你要运行一个命令在指定的情况下, 你可以队列命令行 当你需要运行它时通知它
如果你要运行一个命令如果另外的命令成功或者失败,
你可以使用only_if或者unless 选项:
task "ppm", group=>"myservers", sub {
my $count= run "ps -ef | grep -i mysql | wc -l";
say $count;
};
[root@node01 Rex]# rex ppm
[2017-05-01 12:15:19] INFO - Running task ppm on 192.168.137.3
4
[2017-05-01 12:15:30] INFO - All tasks successful on all hosts
[root@node01 Rex]#
can_run($command)
这个函数检查如果一个命令行在一个path是可用的,你可以指定多个命令行,第一个找到的命令会被返回；
task "uptime",group=>"myservers", sub {
if( my $cmd = can_run("xx", "uname -a") ) {
say run $cmd;
}
};
[root@node01 Rex]# rex uptime
[2017-05-01 12:22:05] INFO - Running task uptime on 192.168.137.3
Linux
[2017-05-01 12:22:16] INFO - All tasks successful on all hosts
[root@node01 Rex]#