Authorized users only. All activities may be monitored and reported.

Authorized users only. All activities may be monitored and reported.

1. ssh密钥对认证登录，提示：
Authorized user only. All activities may be monitored and reported.
shell request failed on channel 0

原因：
连接用户的进程上限问题

解决：
修改 /etc/security/limits.conf 或 /etc/security/limits.d/20-nproc.conf 中的该用户相关的设置
user1   soft   nproc   4096

可能是连接的用户进程上限。

可考虑让root用户去修改/etc/security/limits.conf 或 /etc/security/limits.d/20-nproc.conf 中的该用户相关的设置。

22.4 [lightdb@localhost ~]$ cat /etc/security/limits.conf
# /etc/security/limits.conf
#
#This file sets the resource limits for the users logged in via PAM.
#It does not affect resource limits of the system services.
#
#Also note that configuration files in /etc/security/limits.d directory,
#which are read in alphabetical order, override the settings in this
#file in case the domain is the same or more specific.
#That means for example that setting a limit for wildcard domain here
#can be overriden with a wildcard setting in a config file in the
#subdirectory, but a user specific setting here can be overriden only
#with a user specific setting in the subdirectory.
#
#Each line describes a limit for a user in the form:
#
#            
#
#Where:
# can be:
#        - a user name
#        - a group name, with @group syntax
#        - the wildcard *, for default entry
#        - the wildcard %, can be also used with %group syntax,
#                 for maxlogin limit
#
# can have the two values:
#        - "soft" for enforcing the soft limits
#        - "hard" for enforcing hard limits
#
# can be one of the following:
#        - core - limits the core file size (KB)
#        - data - max data size (KB)
#        - fsize - maximum filesize (KB)
#        - memlock - max locked-in-memory address space (KB)
#        - nofile - max number of open file descriptors
#        - rss - max resident set size (KB)
#        - stack - max stack size (KB)
#        - cpu - max CPU time (MIN)
#        - nproc - max number of processes
#        - as - address space limit (KB)
#        - maxlogins - max number of logins for this user
#        - maxsyslogins - max number of logins on the system
#        - priority - the priority to run user process with
#        - locks - max number of file locks the user can hold
#        - sigpending - max number of pending signals
#        - msgqueue - max memory used by POSIX message queues (bytes)
#        - nice - max nice priority allowed to raise to values: [-20, 19]
#        - rtprio - max realtime priority
#
#                 
#

#*               soft    core            0
#*               hard    rss             10000
#@student        hard    nproc           20
#@faculty        soft    nproc           20
#@faculty        hard    nproc           50
#ftp             hard    nproc           0
#@student        -       maxlogins       4

# End of file
lightdb hard core unlimited
lightdb soft core unlimited
lightdb hard nofile 524288
lightdb soft nofile 524288
lightdb hard nproc 16384
lightdb soft nproc 16384
22.4 [lightdb@localhost ~]$ cat /etc/security/limits.d/20-nproc.conf
# Default limit for number of user's processes to prevent
# accidental fork bombs.
# See rhbz #432903 for reasoning.

*          soft    nproc     4096
root       soft    nproc     unlimited
22.4 [lightdb@localhost ~]$ ping 10.19.69.186
PING 10.19.69.186 (10.19.69.186) 56(84) bytes of data.
^C
--- 10.19.69.186 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3062ms

22.4 [lightdb@localhost ~]$ 

实在不行，用下面跳转的方式：

[lightdb@lightdb1 ~]$ ssh [email protected]
The authenticity of host '10.20.248.5 (10.20.248.5)' can't be established.
ECDSA key fingerprint is SHA256:ijuCD5sp64kuWuVK9iv17eVB9a+hl3P6qW64pD52/1I.
ECDSA key fingerprint is MD5:56:61:ed:24:ec:fe:d2:49:e8:cf:df:6f:f1:02:57:7b.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.20.248.5' (ECDSA) to the list of known hosts.

Authorized users only. All activities may be monitored and reported.
[email protected]'s password: 

Authorized users only. All activities may be monitored and reported.
Web console: https://localhost:9090/ or https://10.20.248.5:9090/

Last login: Tue Apr 25 13:09:32 2023 from 10.188.127.39

[lightdb@localhost ~]$ ip a
1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens192: mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:50:56:8f:29:28 brd ff:ff:ff:ff:ff:ff
    inet 10.20.248.5/24 brd 10.20.248.255 scope global ens192
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:fe8f:2928/64 scope link 
       valid_lft forever preferred_lft forever
[lightdb@localhost ~]$ ll