All Questions
22 questions
0
votes
0
answers
210
views
CentOS 7 - disable all services, except ssh and networking
This is a follow up question to Disable all services, except ssh. I want to achieve the same thing on CentOS 7 but I'm having trouble getting it to work.
I've created /usr/lib/systemd/system/...
- 103
8
votes
4
answers
9k
views
How can I run a shell as a user that has no shell access?
Maybe I'm not using the right terms so allow me to explain myself using an example. Connecting over SSH as user "centos" and executing cat /etc/passwd in my Centos7 machine I get:
centos:x:...
- 415
2
votes
2
answers
13k
views
How do I disable sshd algorithms?
From my vulnerability scanning software I get this flag/message
The following weak key exchange algorithms are enabled :
diffie-hellman-group-exchange-sha1
diffie-hellman-group1-sha1
I want to ...
- 21
0
votes
2
answers
1k
views
Require root password when executing "sudo -s"
I have a CentOS 7 server on AWS.
When logged in with the centos user, how can I prevent sudo -s logging in to root without requiring root's password?
[root@server ~]# cat /etc/sudoers | grep rootpw
...
- 673
1
vote
1
answer
334
views
How can I share the SSH keyes between two users on a CentOs 7 machine?
I am not a sysadmin\network specialist (I am s software developer) and I am finding the following difficulty working on a Linux CentOS 7 remote machine of a customer.
I am using MobaxTerm to connect ...
- 197
1
vote
4
answers
3k
views
How to hide tempfs from the df output on CentOS 7 in ssh?
I know this can be done because I've done it before on previous servers but I forgot how and web searches did not come up with the result.
I know what tmpfs is and that you should not remove it. What ...
user250795
0
votes
1
answer
2k
views
sshd is not honoring sshd_config settings
I am adding the following settings to my docker based centos 7 /etc/ssh/sshd_config file:
Match User ansible
PermitEmptyPasswords yes
PasswordAuthentication no
PermitRootLogin ...
- 155
2
votes
1
answer
123
views
How to setup ssh for a couple of servers?
I'm pretty confused about how ssh really works, and I have already asked a couple of questions related to this, but I suspect I'm going in the XY-problem trap.
So, what I want is this. I want to be ...
- 167
0
votes
1
answer
110
views
Is there any security issue when SSH log in user without home directoty?
My system is centos 7.
My purpose is enhance server security,only let sshuser log in and then su root.
I create a user only for SSH login by useradd -M -u 888 sshuser.
I also set AllowUsers sshuer ...
- 995
0
votes
1
answer
1k
views
Putty not showing full path?
Pretty sure this is a stupid question, but I can't seem to find the answer anywhere...
When I use some command lines in Putty, (like top -c) the output is not complete, and I can't see the whole ...
- 3
1
vote
1
answer
2k
views
How to turn off read-only mode in OpenSSH's sftp-server subsystem
Our PCI-compliant CentOS 7 system got flagged by Trustwave as FAILED recently due to an OpenSSH vulnerability tagged as CVE-2017-15906, and was told that "OpenSSH sftp-server allows creating zero-...
- 13
0
votes
0
answers
1k
views
SLURM, SSH, adn NOHUP Behaviour
I am the administrator of a cluster running on CentOS and using SLURM to send jobs from a login node to compute nodes. Recently, a user complained about some unexpected behaviour with their jobs. If a ...
2
votes
0
answers
11k
views
Starting sshd in a Centos 7 OS Docker Container on docker run using both ENTRYPOINT and CMD
I know I can start sshd with CMD ["/usr/sbin/sshd","-D"]
in a CentOS 7 base Docker container with docker run <debug_container_id> because I have seen it done elsewhere
https://stackoverflow....
- 331
2
votes
1
answer
2k
views
Force password for ssh login
I have two servers with CentOS6 and CentOS7.
Both of them has SSH access. My client computer has Ubuntu 16.04.
For CentOS6 I can login with command
ssh -i ~/.ssh/serv1 root@serv1
but command
ssh ...
- 193
4
votes
1
answer
10k
views
SSH fails after Port change on CentOS 7
After changing the port.
And restarting the SSH service, it failed on me.
I got the following info when I ran systemctl status sshd.service:
sshd.service: main process exited, code=exited, status=...
- 239
4
votes
2
answers
11k
views
Remote SSH command hangs, but only when executed through Jenkins
Disclaimer: I'm a bit new to the community, please be gentle :)
I'm having an SSH issue that I just can't seem to explain. As a bit of background, here's the problem that I'm solving:
There are ...
- 322
1
vote
1
answer
236
views
CentOS - Pubkey Auth doesn't work for user in /var
I've been working through a problem for the past week or so and I am running out of ideas.
I added a new user on my Centos 7 VPS for a git server, and (under the advice of several articles) placed ...
- 195
3
votes
2
answers
15k
views
Cannot ssh with shared keys on CentOS 7 server refused our key
I cannot ssh to a CentOS 7 server using pre-shared keys, I get a "server refused our key" message. Below is an ssh attempt using -vv
OpenSSH_7.2p2, OpenSSL 1.0.2h-fips 3 May 2016
debug1: Reading ...
- 169
2
votes
1
answer
2k
views
SSH connection is slow and buggy when connected by IPv6
I noticed that my SSH session is not usable (random connection errors, hugh delay, etc.) when I'm connected by IPv6. I'm not connecting to my server by IPv4/IPv6 addresses directly. I use my domain ...
- 257
14
votes
4
answers
23k
views
Can connect via SSH - but not via SFTP? Exit status 127
Unfortunately I can not connect via sftp to my VPS:
This is my sshd_config:
# Package generated configuration file
# See the sshd_config(5) manpage for details
# What ports, IPs and protocols we ...
- 953
1
vote
0
answers
861
views
LXC SSH too slow in CentOS7
I have a newly created centos7. I installed the LXC and create a configuration:
lxc.network.type = veth
lxc.network.link = lxcbr0
lxc.network.hwaddr = fe:84:8b:f1:76:8e
lxc.network.flags = up
lxc....
- 375
-5
votes
2
answers
592
views
Using same port for http/ ssh on two ip's [closed]
How could use two diferent services using the same port on two diferent IP addresses?
Example:
IP 1 : 192.168.10.10:
Service: Http Server
Ports: 443
IP 2 : 192.168.10.11:
Service: SSH Server
...
- 155