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Linux/Unix

How to extract private key- encrypted or decrypted from PFX certificate file ?

By Saket Jain / September 22, 2023

Today in this post, we will see how to extract the private key from PFX certificate file. We will first...

Tags: centos, decrypted, encrypted, key, linux, openssl, pfx, private, redhat, unix

Linux/Unix

Solved: Nagios: qh: Failed to init socket ‘/usr/local/nagios/var/rw/nagios.qh’. bind() failed:

By Saket Jain / September 11, 2023

Today in this post, we will see one of the common error message and its solution. I. Error Message Aug...

Tags: /var, centos, error, file, linux, nagios, nagios.qh, permission, rhel, rw, service, socket, unix

Linux/Unix

Solved: ndo2db: Could not bind socket: Address already in use.

By Saket Jain / September 7, 2023

In this post, we will see one of the common error message of ndo2db and its solution. I. Error Message...

Tags: already, centos, daemon, data, error, linux, nagios, ndo2db, out, rhel, socket, solution, unix, use

Linux/Unix

Solved: cannot find -lboost_system-mt.

By Saket Jain / September 7, 2023

Today we will see how to fix one of the error message i encountered while building one of the package...

Tags: build, cannot, cannot find -lboost_system-mt, centos, error, find, lboost, linux, mk-livestatus, nagios, rhel, system-mt

Linux/Unix

How to stop NetworkManager service to modify resolv.conf file ?

By Saket Jain / August 23, 2023

Today we will see one of the most common issue that after rebooting system our resolv.conf file is getting updated...

Tags: bit, centos, conf, configuration, dns, file, linux, manager, network, networkmanager, none, resolv, rhel, state, sticky, unix

Linux/Unix

Solved: SWEET32 Issue, CVE-2016-2183. Check TLS1.0 and disable it in Configuration on Linux.

By Saket Jain / August 21, 2023

In this post, we will see how to solve the sweet32 issue i.e CVE-2016-2183 on a Linux host. Let us...

Tags: 1.0, 2.0, client, connect, CVE-2016-2183, error, openssl, protocol, support, sweet32, s_client, tls, tls1

Linux/Unix

How to see if hyper threading or Multi threading is enabled on Linux or not from OS perspective ?

By Saket Jain / August 20, 2023

In this post, we will understand how to see if hyperthreading or multi-threading is enabled on a Linux server or...

Tags: centos, check, cpuinfo, disable, enable, ht, hyper, hyper threading, linux, os, redhat, rhel, smt, thread, threading, threads, unix

Linux/Unix

Solved: Determine which password-hash support is available on Linux.

By Saket Jain / August 1, 2023

Today we will see a quick tip how to determine the password hash which are supported in our Linux System....

Tags: algo, algorithm, algorithms, centos, hash, hashing, md5, password, rhel, sha, sha-256, sha-512

Linux/Unix

Configure NFS v4 only server in RHEL/Centos 8. Is it possible on RHEL 6 and RHEL 7 ?

By Saket Jain / July 19, 2023

Today we will see the steps how to create NFS v4 only server in linux. We will see how to...

Tags: $3, $8, -V, 6, 7, centos, linux, nfs, nfs.conf, nfsmount.conf, redhat, rhel, server, support, v2, v4

Linux/Unix

Solved: Disable core generation on a Linux system for all users: RHEL 6,7,8.

By Saket Jain / July 11, 2023

In this post, we will see how to disable core generation on Linux. Lets see the steps we need to...

Tags: core, coredump, core_pattern, file, generation, size, sysctl.conf, system.conf, systemd, ulimit, ulimit -c

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Saket Jain on How to configure and install Nagios Server on Linux ?: “Please check your system resolv.conf/DNS settings, it looks its not able to resolve the hostname. The URL is correct.” Jul 18, 13:37
deepanshu on How to configure and install Nagios Server on Linux ?: “[root@localhost nagios]# wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.5.tar.gz –2023-07-02 19:15:08– https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.5.tar.gz Resolving assets.nagios.com (assets.nagios.com)… failed: Name or service not known. wget: unable to resolve host…” Jul 3, 08:13
aasdasdKEKEK on Solved: subscription-manager – Not supported by a valid subscription.: “You Genius. How do we “verify if we have enough subscription available on redhat support to add this new server.”” May 27, 18:26
Ryan on How to schedule a cron to execute on first monday of every month ?: “You can do 0 3 */99,1-7 * mon /root/test.sh which does: if minute==0 AND hour==3 AND (every 99th day of month OR day between…” May 9, 06:07
KristoR on Counts characters inside a file in Linux bash.: “Thanks for the article. One important correction: the syntax for character count is wc -m. -c is for bytes.” Jan 6, 08:12

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