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À partir d’avant-hiernixCraft

How do you add comments on UFW firewall rule?

Par : Vivek Gite
See all Firewall related FAQ

The iptables and ip6tables commands are used to set up a Linux firewall. However, many new Linux sysadmins and users find it challenging to use iptables. Hence, the ufw program is for managing a Linux firewall and aims to provide an easy-to-use interface for the user. This page explains how to add a comment to your ufw firewall rules.

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The post How do you add comments on UFW firewall rule? appeared first on nixCraft.

Linux Filesystem Error: Transaction failed when using LXD

Par : Vivek Gite
See all LXD related Howtos/Tutorials

I am a big fan of LXD, a next-generation Linux system container manager and default on Ubuntu. It allows me to run desktop apps or server apps in an isolated environment. Ubuntu provides LXD with robust security in mind. However, this might lead to undesired side effects, such as individual packages under OpenSUSE or CentOS Linux may not be updated. One such package is the filesystem package. Let us see how to fix Error: Transaction failed when you try to update filesystem package under CentOS, OpenSUSE, and other Linux containers running under LXD.

The post Linux Filesystem Error: Transaction failed when using LXD appeared first on nixCraft.

How To Set Up a Firewall with Awall on Alpine Linux

Par : Vivek Gite

Alpine Wall (Awall) is an easy to use interface to iptables for Alpine Linux users. While iptables and ip6tables is an excellent command, it can be challenging for new Alpine Linux users. The awall tool has easy to follow high-level concepts such as zones, limits, policies, and a single source for both IPv4 and IPv6. This tutorial will show you how to set up a firewall with Awall on Alpine Linux.

The post How To Set Up a Firewall with Awall on Alpine Linux appeared first on nixCraft.

How to save iptables firewall rules permanently on Linux

Par : Vivek Gite

How to save iptables firewall rules permanently on Linux
I am using Debian / Ubuntu Linux server. How do I save iptables rules permanently on Linux using the CLI added using the iptables command? How can I store iptables IPv4 and IPv6 rules permanently on the Debian Linux cloud server?

The post How to save iptables firewall rules permanently on Linux appeared first on nixCraft.

How to install less on CentOS / RHEL / Fedora

Par : Vivek Gite

One of my PHP and bash scripts depends upon less command to display the help system to other users. But, whenever they run less on a particular version of CentOS or RHEL cloud server, they get an error that reads as: "bash: less: command not found." How do I install less utility on CentOS or RHEL (Red Hat Enterprise Linux)/Fedora Linux server? How can I configure Linux containers such as Docker or Podman to install less automatically?

The post How to install less on CentOS / RHEL / Fedora appeared first on nixCraft.

ERROR: Test failed: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1091)

Par : Vivek Gite

When I install s3cmd package on my FreeBSD system and try to use the s3cmd command I get the following error:
    ERROR: Test failed: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1091)
How do I fix this problem on FreeBSD Unix system?

The post ERROR: Test failed: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1091) appeared first on nixCraft.

Nginx upstream sent too big header while reading response header from upstream

Par : Vivek Gite

Nginx upstream sent too big header while reading response header from upstream

I am getting the following error and my app stops working:
    2020/07/12 14:32:03 [error] 45625#45625: *10918 upstream sent too big header while reading response header from upstream, client: 139.xxx.yyy.zzz, server: www.nixcraft.com, request: "POST /app/mg/posts HTTP/2.0", upstream: "fastcgi://unix:/run/php/php-fpm.sock:", host: "www.nixcraft.com", referrer: "https://www.nixcraft.com/mg/admin/index.app"
How do I fix this error for Nginx web server running on Linux or Unix-like systems?

The post Nginx upstream sent too big header while reading response header from upstream appeared first on nixCraft.

Systemd systemctl list all failed units/services on Linux

Par : Vivek Gite

Is there is a command to print list all failed units or services when using systemd on Linux? Can you tell me the systemctl command to show failed services on Linux?

The post Systemd systemctl list all failed units/services on Linux appeared first on nixCraft.

How to enable firewalld logging for denied packets on Linux

Par : Vivek Gite

How do I enable firewalld logging for denied packets on Linux operating systems so that I can view all dropped packets information? How can I view a log of the traffic blocked by FirewallD under a CentOS/RHEL (Red Hat Enterprise Linux)/Suse/OpenSUSE Linux?

The post How to enable firewalld logging for denied packets on Linux appeared first on nixCraft.

Linux iptables delete prerouting rule command

Par : Vivek Gite

I am a new Linux server sysadmin. I need to delete the PREROUTING rule. How do I delete the prerouting rule on Linux server?

The post Linux iptables delete prerouting rule command appeared first on nixCraft.

Remove Santa Hat in VLC Player Permanently

Par : Vivek Gite

How do I remove Santa Hat in VLC media player that displayed during Christmas time during 18th December to 1st January?

The post Remove Santa Hat in VLC Player Permanently appeared first on nixCraft.

How to test and validate DNSSEC using dig command line

Par : Vivek Gite

How do I test and validate DNSSEC using the dig command line under Linux, macOS, *BSD, and Unix-like systems?

The post How to test and validate DNSSEC using dig command line appeared first on nixCraft.

How to set up a firewall using FirewallD on OpenSUSE Linux

Par : Vivek Gite

I am a new OpenSUSE Linux 15.x sysadmin. How do I set up a firewall using FirwallD on OpenSUSE Linux 15.1?

The post How to set up a firewall using FirewallD on OpenSUSE Linux appeared first on nixCraft.

How to check hard drive health on FreeBSD

Par : Vivek Gite

How do I read my hard disk/SSD health using smartctl command on FreeBSD operating system? How can I hard drive health on FreeBSD and find out if my disk is dying?

The post How to check hard drive health on FreeBSD appeared first on nixCraft.

Linux disable firewall command

Par : Vivek Gite

I am a new Linux system administrator. I have a hardware-based firewall, so I don't need a firewall on each server. How do I disable the firewall on Linux?

The post Linux disable firewall command appeared first on nixCraft.

Perl: warning: Setting locale failed in Debian and Ubuntu

Par : Vivek Gite

I am trying to install package and doing some other work. But, getting the error that read as "perl: warning: Setting locale failed. perl: warning: Please check that your locale settings:" How do I fix this problem on my Debian Linux server?

The post Perl: warning: Setting locale failed in Debian and Ubuntu appeared first on nixCraft.

FreeBSD wget cannot verify certificate, issued by Let’s Encrypt

Par : Vivek Gite

I installed GNU wget utility on FreeBSD as explained here. However, whenever I use the wget command to download stuff from the Internet, it says:
   ERROR: cannot verify download.freebsd.org's certificate, issued by 'CN=Let\'s Encrypt Authority X3,O=Let\'s Encrypt,C=US':
    Unable to locally verify the issuer's authority.

How do I fix this problem on FreeBSD 12?

The post FreeBSD wget cannot verify certificate, issued by Let’s Encrypt appeared first on nixCraft.

How to setup a UFW firewall on Ubuntu 18.04 LTS server

Par : Vivek Gite

How do I setup a firewall with UFW (uncomplicated firewall) on an Ubuntu Linux 18.04 LTS server to restrict traffic on my personal Ubuntu web-server that hosts my cat's blog? How do I set up a firewall with UFW on Ubuntu 18.04 LTS?

The post How to setup a UFW firewall on Ubuntu 18.04 LTS server appeared first on nixCraft.

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