SSH 命令在控制台中有效,但在 bash 脚本中无效 - 如何诊断?

SSH 命令在控制台中有效,但在 bash 脚本中无效 - 如何诊断?

我有一个执行多个 ssh 命令的 bash 脚本,但遇到了问题。我一直在为脚本添加自动 ssh 密钥生成功能,但遇到了一个奇怪的错误,即通过控制台手动输入时 ssh 命令可以工作,但在脚本内不起作用。

该系列命令如下。 (密钥生成>检查远程脚本>执行远程脚本)

mkdir -p ~/.ssh
echo "StrictHostKeyChecking no" > ~/.ssh/config
ssh-keygen -q -t rsa -N '' <<< ""$'\n'"y" 2>&1 >/dev/null
sshpass -f password.txt ssh-copy-id [email protected]
ssh [email protected] "test -e /home/user/script.sh"
ssh [email protected] "echo password | sudo -S /home/user/script.sh > log.txt"

这在控制台中完美地工作,但突然在脚本中不起作用。唯一的区别是,脚本中存在一些将数据附加到日志的回显,这不会影响 ssh 命令。

第一个 ssh 命令有效,但第二个命令无效。它收到连接拒绝 6 次,通常返回 255 退出。下面是使用 -v 标志运行时的示例日志。ssh [email protected] "test -e /home/user/script.sh"ssh [email protected] "echo password | sudo -S /home/user/script.sh > log.txt"

OpenSSH_7.2p2 Ubuntu-4ubuntu2.4, OpenSSL 1.0.2g  1 Mar 2016
debug1: Reading configuration data /root/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to x.x.x.x [x.x.x.x] port 22.
debug1: connect to address x.x.x.x port 22: Connection refused
ssh: connect to host x.x.x.x port 22: Connection refused
OpenSSH_7.2p2 Ubuntu-4ubuntu2.4, OpenSSL 1.0.2g  1 Mar 2016
debug1: Reading configuration data /root/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to x.x.x.x [x.x.x.x] port 22.
debug1: connect to address x.x.x.x port 22: Connection refused
ssh: connect to host x.x.x.x port 22: Connection refused
OpenSSH_7.2p2 Ubuntu-4ubuntu2.4, OpenSSL 1.0.2g  1 Mar 2016
debug1: Reading configuration data /root/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to x.x.x.x [x.x.x.x] port 22.
debug1: connect to address x.x.x.x port 22: Connection refused
ssh: connect to host x.x.x.x port 22: Connection refused
OpenSSH_7.2p2 Ubuntu-4ubuntu2.4, OpenSSL 1.0.2g  1 Mar 2016
debug1: Reading configuration data /root/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to x.x.x.x [x.x.x.x] port 22.
debug1: connect to address x.x.x.x port 22: Connection refused
ssh: connect to host x.x.x.x port 22: Connection refused
OpenSSH_7.2p2 Ubuntu-4ubuntu2.4, OpenSSL 1.0.2g  1 Mar 2016
debug1: Reading configuration data /root/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to x.x.x.x [x.x.x.x] port 22.
debug1: connect to address x.x.x.x port 22: Connection refused
ssh: connect to host x.x.x.x port 22: Connection refused
OpenSSH_7.2p2 Ubuntu-4ubuntu2.4, OpenSSL 1.0.2g  1 Mar 2016
debug1: Reading configuration data /root/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to x.x.x.x [x.x.x.x] port 22.
debug1: connect to address x.x.x.x port 22: Connection refused
ssh: connect to host x.x.x.x port 22: Connection refused

还有运行时的 ps aux。

ps aux | grep ssh
root      1287  0.0  0.3  65504  6500 ?        Ss   Sep18   0:02 /usr/sbin/sshd -D
root      4409  0.0  0.0  14220   888 pts/0    S+   11:14   0:00 grep --color=auto ssh
root     20680  0.0  0.3  94860  6900 ?        Ss   09:09   0:00 sshd: user [priv]
user    20760  0.0  0.1  94860  3540 ?        S    09:09   0:00 sshd: user@notty
user    20761  0.0  0.1  12876  2000 ?        Ss   09:09   0:00 /usr/lib/openssh/sftp-server
root     21024  0.0  0.3  94860  7052 ?        Ss   08:13   0:00 sshd: user [priv]
user    21133  0.0  0.2  94860  4636 ?        R    08:13   0:04 sshd: user@pts/0

所以我的问题是,如何准确诊断并解决这个问题?

先谢谢了。

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