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Linux
Discussion List
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OSMH : Instance suddenly into offline statusApplies to: OSMH On-Prem Goal: OS Management Hub (OSMH) instance suddenly goes into offline status, and the management agent service exits. Even after restarting the man… -
postfix and oci smtp serverHi, I've an Oracle Linux vm, version 7.9 and Postfix 2.10.1 I'm trying to use postfix as a relay server, and I've used oci smtp credentials of a dedicated oci user to se…
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Problem switching from networkd to NetworkManager on Ubuntu 22.04On an Ubuntu 22.04 instance on Google Cloud, switching from networkd to NetworkManager is easy: $ sudo apt install network-manager $ sudo nano /etc/netplan/50-cloud-init…
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Could not resolve host: yum.ap-osaka-1.oraclecloud.comHi, currently I wish to update the packages for OL8 on OCI Japan but getting the above message. Can I know how to resolve this error. Thanks in advance. Full error messg…
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Oracle Linux – How to create /dev/zero after accidentally deletedAPPLIES 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: Create the character device /dev/zero … -
Oracle Linux – Fix KSPLICE was unable to install updates because a modified kernel is runningAPPLIES 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: Install latest Ksplice patches. Sympto…Alejandro Rodriguez L.-Oracle 334 views 0 comments 0 points Started by Alejandro Rodriguez L.-Oracle
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OCI: Leapp Fails at "Upgrade requires links in root directory to be relative"APPLIES TO: Oracle Cloud Infrastructure Linux x86-64 SYMPTOMS Leapp preupgrade checks fails with below potential risks to the upgrade Risk Factor: high (inhibitor) Title…
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Linux: How To Extend a ROOT(/) Filesystem that is on a Logical Volume Manager (LVM) VolumeThis article describes how to extend the root filesystem "/" on Oracle Linux when it is located on an LVM volume. This procedure may be necessary if the root filesystem … -
SUDO Error "sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set"After connecting to the instance as an opc user, when you try sudo to root user, the following error is seen: [opc@ ~]$ sudo su - sudo: /usr/bin/sudo must be owned by ui…
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OCI: Yum Reports Error "Could not resolve host: yum$ociregion.$ocidomain; Unknown error"When trying to install packages on an Oracle Cloud Instance running a custom Oracle Linux image, yum fails with the following error: # yum -y install net-snmp Loaded plu…
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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…
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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…
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Memory Management Related Posts on Oracle Linux BlogThe NUMA Awareness of the Linux Scheduler Memory Correctable Error (CE) - Userspace Control soft-offline pages oomwatch - A Userspace Out of Memory Killer - OLED Memstat…
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KVM Related Posts on Oracle Linux BlogIntroduction to CPU Hotplug Configuring Windows Failover Cluster for KVM/QEMU Building KVM selftest static binary on Oracle Linux 8 Virtual Machine UEFI Firmware Debug M…
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Data Storage Related Posts on Oracle Linux BlogIntroduction to ASMLib v3 Using drop_caches probably won’t crash your system What’s new for NFS in Unbreakable Enterprise Kernel Release 8? Device Mapper Multipath, an I…
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Oracle Cloud Infrastructure Related Posts on Oracle Linux BlogKVM Nested Virtualization in Oracle Cloud Infrastructure: A Hands-on Guide with Virtual Machines and Oracle Linux 9.5 Using Leapp to Upgrade Systems Managed by OS Manage…
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Kernel Related Posts on Oracle Linux BlogUEK8 Packaging Internals What’s new in File Systems with UEK8: Btrfs, XFS, and NFS updates Folio Wins Without Trying When cgroup v2 meets nftables: A migration story ign…
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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 BlogKsplice and Tracing Hooks in the Kernel Ksplice Known Exploit Detection for nftables (Netfilter) Pinning User-space Pages in the Linux Kernel: Exploring get_user_pages, …
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Diagnostics Related Posts on Oracle Linux BlogIntroducing the list_lru iterator in drgn-tools Beyond EH Frame and Frame Pointers: The Technical Underpinnings of SFrame Closing A Hole In The Detection Of Buffer Overf…
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Cloud Native Computing Related Posts on Oracle Linux BlogUpgrading Oracle Kubernetes Engine (OKE) with zero impact using OCI Load Balancer and draining Using OCI Object Storage buckets as a Persistent Volume Claim (PVC) in OCI…
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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 116 views 0 comments 0 points Started by Alejandro Rodriguez L.-Oracle
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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…