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Linux
Discussion List
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SSH Fails With Error: "FIPS mode initialized FIPS mode initialized ssh: connect to host <host name>SSH connections to an Oracle Linux 7 or higher fail, with the following errors logged to /var/log/secure: Oct 28 09:44:40 sshd: FIPS mode initialized Oct 28 09:44:40 s… -
Postfix Mail Server "/var/spool/postfix/maildrop" Mail Queue Fills /var on Linux InstanceA Linux instance is running the Postfix mail server. The /var/ filesystem on the server has filled to 100% utilization, and further checking subdirectories in /var shows…
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OCI: UFW Was Enabled on Ubuntu and SSH Connections Started to Fail With Connection Refused ErrorAn Ubuntu Instance started to experience "Connection Refused" errors when trying to log in to the server using ssh. This issue only started to occur after the Uncomplica…
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OCI: Linux User Account Incorrectly Set to "nologin"A local user account on a Linux instance was configured to use the nologin shell in error, as the user account needs to be able to log in to the Linux instance. Attempti…
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Unable to Remove LVM Snapshot - “Logical volume XYZ contains a filesystem in use."Attempting to remove an LVM snapshot on a linux instance fails with the following error: # lvremove /dev/VGExaDb/LVDbVar1Snap Logical volume VGExaDb/LVDbVar1Snap contain…
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System crash with: NMI received for unknown reason XX on CPU YApplies to: Oracle Linux - Version 7 and later Symptoms System crashed Crash report: [ 5629.913381] Uhhuh. NMI received for unknown reason 10 on CPU 5. [ 5629.913382] Do… -
Memory Management Related Posts on Oracle Linux Blogoomwatch - A Userspace Out of Memory Killer - OLED Memstate - OLED PKRAM Linux Internals: Memory UE Handling and HWpoison Injection Detecting Kernel Memory Leaks using a…
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KVM Related Posts on Oracle Linux BlogIntroducing NVMe Atomic Write Support with QEMU 9.2 Improve virtio-blk device performance using iothread-vq-mapping Improve vhost-scsi Device Performance Using the worke…
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Data Storage Related Posts on Oracle Linux BlogDevice Mapper Multipath, an Introduction Oracle Linux 8: Disk Management made easy with short training videos How long does your IO take ? An Introduction to the io_urin…
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Oracle Cloud Infrastructure Related Posts on Oracle Linux BlogUsing Leapp to Upgrade Systems Managed by OS Management Services Manage Oracle Linux Systems on Oracle Government Cloud with OS Management Hub OS Management Hub simplifi…
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Kernel Related Posts on Oracle Linux BlogCorelens: a Microscope for Your Vmcores entropy_avail = 256 is good enough for everyone Jiffies : The Heartbeat of the Linux Operating System Writing a block I/O filter …
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Oracle Linux Learning HUBWelcome to Oracle Linux Learning HUB This thread provides you with information to help you grow your skillset using Oracle Linux. In this thread we have organized Oracle…
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Ksplice Related Posts on Oracle Linux BlogPinning User-space Pages in the Linux Kernel: Exploring get_user_pages, pin_user_pages, and Page Table Walking Ksplice Known Exploit Detection for io_uring, glibc, overl…
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Diagnostics Related Posts on Oracle Linux BlogIntroducing Oracle Linux Enhanced Diagnostics scripts - A tool to run various useful OLED diagnostic scripts Kstack - OLED Lkce - OLED SCSI DTrace - OLED RDS DTrace - OL…
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Cloud Native Computing Related Posts on Oracle Linux BlogUsing OCI Object Storage buckets as a Persistent Volume Claim (PVC) in OCI Kubernetes Engine (OKE) Using OCI Object Storage buckets in OCI Kubernetes Engine (OKE) Oracle…
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While Integrating Oracle Weblogic with SunPKCS11 the alias name is getting changedHi community members, I am trying to integrate Oracle WebLogic Server with SunPKCS11 so that it can load the certificate from HSM. After creating CA signed certificate o…
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OCI: Some PDF Documents not Being Printed by CUPS and Remain in the QueueApplies to: Oracle Cloud Infrastructure - Version N/A and later Linux x86-64 – Oracle Linux 7 and later Symptoms Printers work correctly and are able to print PDF docume…
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FTPS accounts are unable to connect getting ciphers errorsSummary: Content (required): Version (include the version you are using, if applicable): Code Snippet (add any code snippets that support your topic, if applicable): -
Oracle Linux – How to Change Default Boot KernelAPPLIES TO: Linux OS – Version Oracle Linux 7.0 to Oracle Linux 9.0 [Release OL7 to OL9] Linux x86_64 on Oracle Public Cloud GOAL: This document describes how to change …Alejandro Rodriguez L.-Oracle 112 views 0 comments 0 points Started by Alejandro Rodriguez L.-Oracle -
How To Disable Weak Ciphers such as Cipher Block Chaining (CBC) Ciphers on Oracle LinuxIt is possible to limit what ciphers can be used with the ssh service on Linux distributions, and weak ciphers, such as CBC ciphers and the HMAC MD5 algorithms can be di…
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New Ubuntu Instance Gets Error "No route to host" For Hosts On External NetworksA newly created Ubuntu Instance running in Oracle Cloud Infrastructure (OCI) encounters an error "No route to host" whenever it tries to connect to HTTP and HTTPS servic…
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IPS Kernel module for IBM ServeRaid 7kHello. I was using Oracle Linux 6 on an old server using ServRaid 7k. When trying to install OL7 or OL8, the drives are not recognized. I know it was using IPS kernel mo…
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How to configure a printer to receive print requests from oracle cloud?Summary: Our Solaris 11.4 on Sparc systems have network printers configured with CUPS, now we are in the plan to migrate the systems to Oracle cloud infrastructure. I wo…
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Ksplice Error "Unable to Install This Update Because Your Running Kernel Has Been Modified"An Oracle Linux server encounters errors when attempting to download and install new ksplice uptrack updates, and fails with the error message, as seen in the following …
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How To Install 32-bit Packages on Systems Running 64-bit Versions of Oracle LinuxSometimes, specific applications on a server using x86_64 based architecture will need to use 32-bit OS Libraries, even though the version of Linux running on the server…
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How To Boot An Ubuntu Server Into Recovery ModeIf you need to troubleshoot or resolve problems with an Ubuntu Server failing to boot correctly, you can boot into recovery mode by selecting some options available in U…
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How To Reset the root Password on Oracle Linux In Rescue ModeIt is possible to reset the root password systems running Oracle Linux 7 or higher without knowing the current root password by booting the server into rescue mode via s…
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How To Downgrade a Distribution Upgrade on an Ubuntu Instance on Oracle Cloud Infrastructure (OCI)Linux distribution upgrades, including Ubuntu distribution upgrades, result in many major package upgrades, and in general it is not feasible to downgrade all the packag…
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How To Check The Network Configuration on a Linux InstanceThe ip command can be used with different options to check and configure network devices on a Linux system. To check the current network link-layer configuration for all…
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How To Create an Ubuntu Instance Using Oracle Cloud Infrastructure (OCI) Platform ImagesYou can create an instance running Ubuntu in OCI by selecting any of the available Ubuntu Platform Images when creating the instance. For more details on the current Pla…