Questions tagged [linux]

Linux is the generic term for a UNIX-like open source operating system based on the Linux kernel.

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Upon creation of new user non-existent groups added

I am little puzzled with below outcome. I am logged in as root and created 2 new user. tecmint and tecmint2. New user became part of group that I cant find in /etc/group. How can I find out why this ...
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Internet Timeouts When 'code-okay' Interface Exists

A laptop with Linux Mint 19.3 started to have networking issues. It seems that the problem started after removing Pritunl VPN client. Symptoms: DNS resolution works but attempt to connect to internet ...
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Permission Denied while trying to ssh or copy key to another system [closed]

I've been stuck on a really persistent issue with ssh while trying to use it with Ubuntu Server running on a Raspberry Pi 4. I'm using an Ubuntu terminal on Windows. The problem is when trying to ssh ...
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SSLProtocol: Illegal protocol 'TLSv1.1' in linux

I know u think this a duplicate question but hear me out first. I am not able to find the answer with a system with same conf as min so here is my server conf: Red Hat 4.1.2-44 CentOS release 5 ...
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1answer
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Can't ssh login from a remote network [closed]

I relied on ssh to login to my home server from a laptop (both machines were on a local network). Now I am working away from home, so I tried to ssh login from the same laptop to the server's public ...
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how to health check haproxy backend with different IP?

I am running 2 haproxy servers that keep state of each other with keepalived to be fault tolerant. These haproxies have many frontends and backends, in order to avoid port exhaustion when forwarding ...
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samba problems with trailing dot

I am running Samba 4.4.16 on a Synology. I recently found out that trailing dots are a problem for folders names - at least when connecting from macOS. I had to enable "Enable VFS module to ...
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Can Linux kernel support RSTP (802.1w)?

Last week, I ran Spanning Tree Protocol (STP) in Linux kernel successfully. Now, I am trying to support Rapid Spanning Tree Protocol (RSTP) in Linux kernel. I also found out some solutions in user ...
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Rasp Pi OS Installation [closed]

Sandisk 128gb micro SD. plugged into usb converter. Initial fdisk format: Device Boot Start End Sectors Size Id Type /dev/sdf1 * 2048 249737215 249735168 119.1G c W95 FAT32 (LBA) ...
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Systemd service not starting - 'Failed at step EXEC spawning… Permission denied'

I've read other answers for similar issues (Failed at step EXEC spawning... Permission denied) and none seem to apply. After I upgraded my bitcoin node to v0.20.0 it is no longer starting on boot nor ...
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Does cron @reboot run before systemd?

A command defined as @reboot in the root crontab runs before or after systemd services? Is it random or OS dependent?
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NFS server with out of memory

I have multiple machines sharing home directory via NFS share used by 6-10 users. All machines are used to run computational experiments including the one with NFS server. Although it is very rare but ...
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1answer
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My swap memory at 60%, looking to reduce it [closed]

I noticed that my Swap memory is at 60'% and I no that swap memory slows down your PC, is there a way to view whats is swap mem?
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Stretched ESXi cluster with HA enabled has two different gateways at each site

The hypothetical situation is as follows: There are two adjacent sites where a spanned Vlan is created, lets call the sites "Albuquerque" and "Mesa". The sites each have their own ...
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How to enable pam and disallow root/password login for ssh?

I want do disable password and root login via ssh. I followed this guide https://www.cyberciti.biz/faq/how-to-disable-ssh-password-login-on-linux/. It suggests making the following changes to /etc/ssh/...
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mod_remoteip on Debian with ISPConfig

Anyone any experience getting this working with ISPConfig installed? I have followed this (I only have apache 2.4 installed, no NGINX) https://support.cloudflare.com/hc/en-us/articles/360029696071-...
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How to block external traffic *except* to specific samba host from libvirtd subnet with firewalld?

I'm kind of baffled I'm unable to come up with so little information on the topic after days of research, but I'm experimenting with Centos8 in my lab and would like to use it as a vm host machine ...
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How can I find all files with access rights only for current user and no access for anyone else

How can I find all files with access rights only for me on my home directory and no access for anyone else?
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Windows 10 only sees 50GB of a Samba share in a 250 HDD

I have a 250 GB HDD where I have a Samba share. Windows computers only see 50GB of the 250. How do I make windows to see the whole available space?
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How to mount an afp shared folder in Debian Linux as a volume?

I have some shared folders in my Mac that I wish to access from my Debian 10. I have researched some solutions to mount it as a volume, this will be good. I found Netatalk that seems powerful but the ...
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1answer
41 views

How to share GCP virtual machine hard disk's files publicly

I have a file system directory(files and folders) in a google cloud platform virtual machine as a mounted disk. I wanted those files should share across all other applications to access those files. ...
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1answer
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What is /usr/sbin/sshd -R?

I saw a curious thing in IDS logs recently. It was a report of an outgoing connection that showed the parent process as /usr/sbin/sshd -R. I am aware of the -R argument to ssh (client) for remote ...
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Can you start a getty on /dev/pts/x ? Want a serial connection between my Linux KVM server host and Windows Guest

Here's what I have going on: I have a Debian server running several services in Docker and a couple in KVM. One of the KVM hosts is a Windows 10 VM that I actually use as a desktop by using PCI ...
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1answer
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Error while trying to do ssl striping :“ iptables: No chain/target/match by that name”

I am getting this error while trying to do SSL-striping: iptables: No chain/target/match by that name While running command: iptables -t nat -A -PREROUTING -p tcp --destination-port 80 -j REDIRECT --...
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1answer
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Bitwarden Self-Hosted on Debian 10x 64 Buster with Apache2

I installed bitwarden on my VPS following this link https://bitwarden.com/help/article/install-on-premise/. I got an error at the end while running bitwarden.sh start The error message was : Creating ...
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1answer
55 views

Change background color in dialogs bash [closed]

I have a server (without GUI), I would like to create a box message in the tty. Is this possible? Getting the example of htop command UPDATE -----------------------------------------------------------...
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23 views

Why is “more” entropy available when the server is busy? [closed]

I am not quite sure if the title of this question is appropriate. I had difficulties finding the correct words and would be happy if someone could submit an edit if he finds a better description. To ...
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is it possible to atomically make a hard link to a file overwriting an existing file in linux? [closed]

so rename() is atomic, and link() is atomic, what I want to do is both in one atomic step. link will fail if newpath exists, whereas rename will overwrite it as part of the atomic operation. What I'm ...
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1answer
27 views

How can I generate multiple ssh keys for a new Ansible server?

I work on an on-premise network, and we have an Ansible server connected via SSH-Keys to around 400 servers. I've wanted to recreate the Ansible VM, due to the fact that it was poorly made on top of ...
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Auth.log full of did not receive identification string from xx.xx.xx.xx

My sshd server is running on an AWS EC2 instance and you have configured it behind an Elastic Load Balancer with a health check on the SSH port, I am seeing the below message in auth.log each time the ...
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Finding a solution to a Network programming issue [closed]

I have a question how can i implement such a solution for this problem : there is a program which it must be run in a shell, as for example: PROGNAME ifs=[IF-LIST] ./desiredprogram ifs=eth01,eth02,...
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1answer
25 views

tcpdump can't open file: permission denied (linux)

I set all filters for Tcpdump in a config file, but when I run this command: sudo tcpdump -i any -w "./mypcap.pcap" -F "myfilters.txt" I get permission denied although my file ...
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1answer
34 views

Fail2ban regex not matching after site moved behind load balancer

I installed fail2ban with nginx and it's working untill i moved it behind load balancer. Bcoz after moving behind load balancer i found there is 2 IP's showing in Logs.I want that fail2ban detect ...
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2answers
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Is there a difference between the CPU of the server and the CPU of the computer? [closed]

Is there a difference between the CPU of the server and the CPU of the computer? Whether the computer's CPU can use the server's CPU
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1answer
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SpectreV1 Mitigation Performance profiling

I am trying to measure the system performance when spectreV1 mitigation is on. I am using stress-ng for that. So far I have tested the system with various stressors like cpu, qsort, str, matrix, ...
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Suppressing ICMP protocol 47 unreachable with userspace GRE implementation

For reasons that would require a lot of irrelevant context to explain, I'm handling GRE packets with a userspace process with a SOCK_RAW/IPPROTO_GRE socket. This is working fine, except that despite ...
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0answers
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Why both interfaces show same throughput on Raspberry Pi Ethernet Bridge? [closed]

Have 2 interfaces on raspberry pi setup as Ethernet bridge (br0). On rpi: eth1 connects to cable modem eth0 connects to cable wifi router All traffic goes through wifi router ; then rpi; then cable ...
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1answer
74 views

ICMP ping fine but tnsping timeout to oracle

We have Oracle running on a Windows server and a couple of Linux clients. Windows clients work just fine. However, running tnsping on a Linux (running RHEL 6.9) client has an interesting issue. Take ...
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35 views

PasswordLess SSH

We have establish a Passwordless SSH connection between Windows Machine and Linux. For this we have copied public key in .ssh/authorized_key in linux machine. SSH connection was working fine and we ...
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Making service listen on pptpd localip in Ubuntu Server

I put the following two lines in /etc/pptpd.conf: localip 10.10.10.10 remoteip 10.10.10.100-200 Then I type service pptpd restart. I'm able to connect to the PPTP server from an external client. Here ...
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0answers
15 views

Installing PHP extensions for NGINX [closed]

I am attempting to install PHP extensions for PHP 7.2 on Ubuntu 18.04 with NGINX. Is there a simple way to do that?
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1answer
51 views

Packets taking DNAT rule to local IP disappearing

I've been dealing with quite an odd issue for about the past week now, and I'm wondering if anyone had any advice to continue debugging. We have a machine with two ethernet interfaces, one of which ...
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1answer
27 views

How to block / deny linux user from accessing a site with htaccess? [duplicate]

My site got hit ddos several times till now, i found that ddos traffic generally comes from linux os ... then, i wonder how to block linux users / traffic from accessing a site with htaccess?? Please ...
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0answers
23 views

SSH Tunnel Session

Where can I see the active ssh tunnel sessions? I've already tried who and it's only showing root and not the other users using tunnel the users have /bin/false
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0answers
25 views

How can I set up a mail server? [closed]

I wanna set up a mailserver on my home network. I have a computer 24/7 on, with nginx server running, a zabbix monitor, and pufferpanel to control game servers. I have the devhost.net.br domain set up ...
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1answer
33 views

Identify source of DNS queries [closed]

I am running Pi-hole as the DNS server on our home network. There is a continuous stream of about 400 queries per minute of alternating requests for "A" and "AAAA" records from ...
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30 views

Raspberry as network gateway [closed]

I'm trying to setup a mini gateway with a Raspberry connected to a DSL Router and an Android Hotspot. Here is the schema: network I have a network 192.168.178.0/24 on the DSL router I have a network ...
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2answers
48 views

Linux XFS partition could not be mounted (can't read superblock) due to suddenly power shutdown, xfs_repair: read failed: Input/output error

After suddenly shutdown, my home directory which is a XFS partition could not be mounted and I can login to system by my account. But I can login with root account (because root and home directories ...
2
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2answers
45 views

Replicating storage efficiently

I want to replicate in the region of 10Tb of data (lots of smallish files, low level of churn) across a WAN with minimal impact on the available infrastructure. While I could simply use rsync, this ...
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1answer
19 views

Stop sysstat sar

How to stop sar collecting system activity without uninstalling sysstat? I have used systemctl stop sysstat but as I understand from running sar it continues collecting system activity.

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