What does the sshd process from "ps aux" mean? Can I reconnect to it?

Chuan

4/30/23, 10:46 PM

I started using Elastic Cloud Computing on AWS and noticed that when I close and reopen my laptop my ssh session is stuck. When I re-ssh into the virtual machine, it opens up a new session.

I ssh into the server using ec2-user username.

I wonder why the old ssh session is still running and can I reconnect to it?

> ps aux

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root      2904  0.0  0.8 152692  8660 ?        Ss   20:28   0:00 sshd: ec2-user [priv]
ec2-user  2922  0.0  0.4 152692  4508 ?        S    20:28   0:00 sshd: ec2-user@pts/2
root      3217  0.0  0.7 112916  7804 ?        Ss   06:35   0:00 /usr/sbin/sshd -D
root      3393  0.0  0.8 152692  8604 ?        Ss   22:26   0:00 sshd: ec2-user [priv]
ec2-user  3411  0.0  0.4 152692  4544 ?        S    22:26   0:00 sshd: ec2-user@pts/0
ec2-user  3439  0.0  0.0 119424   932 pts/0    S+   22:26   0:00 grep --color=auto sshd

> ps auxwwf

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root     10472  0.0  0.8 152692  8516 ?        Ss   01:11   0:00  \_ sshd: ec2-user [priv]
ec2-user 10490  0.0  0.4 152692  4548 ?        S    01:11   0:00  |   \_ sshd: ec2-user@pts/0
ec2-user 10491  0.0  0.5 149940  5232 pts/0    Ss+  01:11   0:00  |       \_ zsh
root     10671  0.0  0.8 152692  8396 ?        Ss   01:17   0:00  \_ sshd: ec2-user [priv]
ec2-user 10689  0.0  0.4 152692  4352 ?        S    01:17   0:00  |   \_ sshd: ec2-user@pts/1
ec2-user 10690  0.0  0.3 124864  3936 pts/1    Ss+  01:17   0:00  |       \_ -bash
root     10774  0.0  0.8 152692  8560 ?        Ss   01:20   0:00  \_ sshd: ec2-user [priv]
ec2-user 10792  0.0  0.3 152692  3532 ?        S    01:20   0:00  |   \_ sshd: ec2-user@pts/2
ec2-user 10793  0.0  0.3 124864  3768 pts/2    Ss+  01:20   0:00  |       \_ -bash
root     14264  0.0  0.8 152692  8720 ?        Ss   02:13   0:00  \_ sshd: ec2-user [priv]
ec2-user 14282  0.0  0.4 152692  4540 ?        S    02:13   0:00      \_ sshd: ec2-user@pts/3
ec2-user 14283  0.0  0.5 152464  5688 pts/3    Ss   02:13   0:00          \_ -zsh
ec2-user 14311  0.0  0.4 164524  4036 pts/3    R+   02:19   0:00              \_ ps auxwwf
root      3254  0.0  0.0   4264   108 ?        Ss    2021   0:00 /usr/sbin/acpid
ec2-user  5688  0.0  1.8 370484 18460 ?        S     2021   0:11 python3 -m http.server

105

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ssh

amazon-ec2

A. Darwin

4/30/23, 9:50 AM

Can you post the output of "ps auxwwf"?

Chuan

5/1/23, 2:21 AM

@A.Darwin I have updated the question

Score:0

Server

John Mahowald

5/1/23, 3:24 AM

No, it is not practical to recover a ssh session after a disconnect.

Consider using a terminal "detach" utility, like tmux or GNU screen. On reconnect these make it easy to reattach to a session. They also have window manager features.

0 + 0

Chuan

5/1/23, 4:41 AM

When a session is disconnected why are there still running sshd processes?

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: What does the sshd process from "ps aux" mean? Can I reconnect to it?

TH: กระบวนการ sshd จาก "ps aux" หมายถึงอะไร ฉันสามารถเชื่อมต่อกับมันอีกครั้งได้หรือไม่?

RO: Ce înseamnă procesul sshd de la "ps aux"? Mă pot reconecta la el?

RU: Что означает процесс sshd из «ps aux»? Могу ли я снова подключиться к нему?

VI: Quá trình sshd từ "ps aux" nghĩa là gì? Tôi có thể kết nối lại với nó không?

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