我正在尝试运行autossh(在运行CentOS6的VM上)，但它会立即退出并显示帮助消息。我认为这是系统问题，因为当我在另一台计算机(运行Ubuntu 14.04)上以完全相同的参数运行它时，它工作正常。当我运行相同的命令但使用ssh而不是autossh时，也很好。因此，我尝试使用strace看看那里是否有任何问题。但是，如果不确定，那是什么。有任何想法吗？
这是autossh命令:autossh -oStrictHostKeyChecking=no -oServerAliveInterval=15 -oServerAliveCountMax=4 -L 3130:localhost:3130 -N -i /path/to/some.pem user@remotehost
这是strace的输出(注意myserver是.ssh/config中的一个条目，其中包含与上一个命令相同的参数):
execve("/usr/local/bin/autossh", ["autossh", "myserver"], [/* 55 vars */]) = 0
brk(0) = 0xefc000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f26193cc000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=36751, ...}) = 0
mmap(NULL, 36751, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f26193c3000
close(3) = 0
open("/lib64/libnsl.so.1", O_RDONLY) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p@\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=113432, ...}) = 0
mmap(NULL, 2198192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f2618f95000
mprotect(0x7f2618fab000, 2093056, PROT_NONE) = 0
mmap(0x7f26191aa000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x15000) = 0x7f26191aa000
mmap(0x7f26191ac000, 6832, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f26191ac000
close(3) = 0
open("/lib64/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p\356\1\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1920936, ...}) = 0
mmap(NULL, 3750152, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f2618c01000
mprotect(0x7f2618d8b000, 2097152, PROT_NONE) = 0
mmap(0x7f2618f8b000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x18a000) = 0x7f2618f8b000
mmap(0x7f2618f90000, 18696, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f2618f90000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f26193c2000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f26193c1000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f26193c0000
arch_prctl(ARCH_SET_FS, 0x7f26193c1700) = 0
mprotect(0x7f2618f8b000, 16384, PROT_READ) = 0
mprotect(0x7f26191aa000, 4096, PROT_READ) = 0
mprotect(0x7f26193cd000, 4096, PROT_READ) = 0
munmap(0x7f26193c3000, 36751) = 0
write(2, "usage: autossh [-V] [-M monitor_"..., 69usage: autossh [-V] [-M monitor_port[:echo_port]] [-f] [SSH_OPTIONS]
) = 69
write(2, "\n", 1
) = 1
write(2, " -M specifies monitor port. M"..., 238 -M specifies monitor port. May be overridden by environment
variable AUTOSSH_PORT. 0 turns monitoring loop off.
Alternatively, a port for an echo service on the remote
machine may be specified. (Normally port 7.)
) = 238
write(2, " -f run in background (autoss"..., 85 -f run in background (autossh handles this, and does not
pass it to ssh.)
) = 85
write(2, " -V print autossh version and"..., 39 -V print autossh version and exit.
) = 39
write(2, "\n", 1
) = 1
write(2, "Environment variables are:\n", 27Environment variables are:
) = 27
write(2, " AUTOSSH_GATETIME - how lo"..., 259 AUTOSSH_GATETIME - how long must an ssh session be established
before we decide it really was established
(in seconds). Default is 30 seconds; use of -f
flag sets this to 0.
) = 259
write(2, " AUTOSSH_LOGFILE - file t"..., 107 AUTOSSH_LOGFILE - file to log to (default is to use the syslog
facility)
) = 107
write(2, " AUTOSSH_LOGLEVEL - level "..., 49 AUTOSSH_LOGLEVEL - level of log verbosity
) = 49
write(2, " AUTOSSH_MAXLIFETIME - set th"..., 65 AUTOSSH_MAXLIFETIME - set the maximum time to live (seconds)
) = 65
write(2, " AUTOSSH_MAXSTART - max ti"..., 69 AUTOSSH_MAXSTART - max times to restart (default is no limit)
) = 69
write(2, " AUTOSSH_MESSAGE - messag"..., 74 AUTOSSH_MESSAGE - message to append to echo string (max 64 bytes)
) = 74
write(2, " AUTOSSH_PATH - path t"..., 53 AUTOSSH_PATH - path to ssh if not default
) = 53
write(2, " AUTOSSH_PIDFILE - write "..., 49 AUTOSSH_PIDFILE - write pid to this file
) = 49
write(2, " AUTOSSH_POLL - how of"..., 70 AUTOSSH_POLL - how often to check the connection (seconds)
) = 70
write(2, " AUTOSSH_FIRST_POLL - time b"..., 71 AUTOSSH_FIRST_POLL - time before first connection check (seconds)
) = 71
write(2, " AUTOSSH_PORT - port t"..., 61 AUTOSSH_PORT - port to use for monitor connection
) = 61
write(2, " AUTOSSH_DEBUG - turn l"..., 104 AUTOSSH_DEBUG - turn logging to maximum verbosity and log to
stderr
) = 104
write(2, "\n", 1
) = 1
exit_group(1) = ?
+++ exited with 1 +++
最佳答案
我在CentOS Linux 7上的autossh 1.4e遇到了完全相同的问题。autossh立即停止并打印了帮助，甚至没有尝试连接SSH。
解决方案是在命令行上指定-M 0:
autossh -M 0 \
-oStrictHostKeyChecking=no \
-oServerAliveInterval=15 \
-oServerAliveCountMax=4 \
-L 3130:localhost:3130 \
-N -i /path/to/some.pem user@remotehost
关于ssh - autossh失败，退出状态为1，并且没有错误消息，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/41280179/