Category 631
Discussion List
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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… -
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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How to Remove Weak Ciphers from SSH in Oracle Linux 8 and 9Applies to: Oracle Linux - Version 8 and later Goal Some Ciphers, Macs and KexAlgorithms used by default in SSHD configuration, are considered weak by some security scan…
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OCI : SSH Login Failed Due To Protocol MismatchApplies To: Oracle Cloud Infrastructure Oracle Linux - Version 6 Symptoms User is not able to login using private key with the following scenarios: Connection using “ssh…
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OCI - How to Install oracle-cloud-agent Package on Oracle Linux PlatformApplies to: Oracle Cloud Infrastructure Linux x86_64 Goal: This document describes how to install oracle-cloud-agent Package on a Oracle Linux Platform Solution: To manu…
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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 …Alejandro Rodriguez L.-Oracle 67 views 0 comments 0 points Started by Alejandro Rodriguez L.-Oracle Linux -
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 355 views 0 comments 0 points Started by Alejandro Rodriguez L.-Oracle Linux
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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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CUPS Fails to Print and Reports “Unable to get printer status”Applies to: Oracle Cloud Infrastructure Symptoms: After configuring a new printer in CUPS, the “lpstat” command shows “Connected to printer” but, after trying to print, …
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SSH Login Reports Error “Could not load host key: /etc/ssh/ssh_host_dsa_key”Applies To: Oracle Cloud Infrastructure - Version N/A and later Linux x86-64 Symptoms: Below messages written into /var/log/secure log file frequently: ... May 8 07:44:5…
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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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OCI: Oracle Linux [UEK-5] Panicks With: "BUG: Bad page state in process lvm pfn:cbea9d1"Applies To: Oracle Linux - Version 7 or later with UEK5 Symptoms: UEK5 can suffer from memory corruption panic. [229802.917409] loop: module loaded [229803.641151] BUG: …
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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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OCI: aide(1) is Failing with FIPSR ErrorApplies To: Linux OS – Version Oracle Linux 7.0 to Oracle Linux 9.0 [Release OL7 to OL9] Linux x86_64 on Oracle Public Cloud Symptoms: AIDE is an intrusion detection uti…Alejandro Rodriguez L.-Oracle 70 views 0 comments 0 points Started by Alejandro Rodriguez L.-Oracle Linux
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“du” Reports Less Space Utilization than “df”Applies to: Oracle Cloud Infrastructure Linux x86-64 Symptoms: The du (/usr/bin/du) and df (/bin/df) commands output display different storage space utilization values: …
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Filesystem on iSCSI Volume is Not Mounted During BootApplies To: Oracle Linux - Version 8 and later Symptoms: Some filesystems randomly fail to be mounted during boot. The filesystems belong to iSCSI block volumes. Log can…
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Security Related Posts on Oracle Linux BlogAnalysis of CVE-2025-4598: systemd-coredump FIPS 140-3 for the Linux Kernel Understanding Spectre v2 Mitigations on x86 Pillars of protection—A holistic view of enterpri…
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Oracle Linux Automation Manager Related Posts on Oracle Linux BlogOracle Linux Automation Manager 2.3 is now available on Oracle Linux 9 Automating Leapp upgrades using OLAM Slack Notifications from Oracle Linux Automation Manager Disc… -
Networking Related Posts on Oracle Linux BlogARP Internals: an in-depth exploration of how ARP functions RoCEv2 Congestion Counters Explained Oracle Linux 9.2 receives IPv6 Ready Gold Logo and meets USGv6-r1 standa…
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Migration Related Posts on Oracle Linux BlogUpdate CentOS Linux for free Still on CentOS Linux 7? Easily switch to Oracle Linux, a stable RHEL-compatible alternative Surprising reasons why CentOS users feeling str…
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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…