Linux
Discussion List
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OCI - Unable to SSH into Instance with Error "connect to host x.x.x.x port 22: Connection refused"Applies to: Oracle Cloud Infrastructure Linux x86-64 Symptoms: Unable to login to OCI instance and attempts fail with error: ssh: connect to host x.x.x.x port 22: Connec… -
System Hang in: "mfe_fileaccess_wake_up_all_events_and_reset_scanningQueue"Applies To: Oracle Cloud Infrastructure - Version N/A and later Linux OS - Version Oracle Linux 6.0 and later Symptoms: Instance hangs with /var/log/messages* showing RI…
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Local user account unable to "su" to another local user accountApplies To: Oracle Cloud Infrastructure - Version N/A and later Linux OS - Version Oracle Linux 5.0 to Oracle Linux 8.3 with Unbreakable Enterprise Kernel [5.4.17] [Rele…
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How to Install pip in OL7 to Enable Python Modules InstallationApplies To: Oracle Cloud Infrastructure - Version N/A and later Goal: Need to install pip to install additional python modules in OL7. Solution: In Oracle Linux 7 OCI in…
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How To Apply Security Update On Oracle Linux 6 and 7Applies to: Linux OS - Version Oracle Linux 6.0 to Oracle Linux 7.6 [Release OL6 to OL7U6] Oracle Cloud Infrastructure - Version N/A to N/A [Release 1.0] Linux x86-64 Go…
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Setting PRESERVE_HOSTINFO=2 in /etc/oci-hostname.conf Does Not Prevent /etc/resolv.conf OverwriteApplies to: Oracle Cloud Infrastructure - Version N/A and later Linux x86-64 Symptoms On : OCI Linux instance Setting PRESERVE_HOSTINFO=2 in /etc/oci-hostname.conf does …
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How to reset a forgotten root password from Serial Console of Oracle Linux instance in OCIApplies to: Oracle Cloud Infrastructure - Version N/A to N/A [Release 1.0] Information in this document applies to any platform. Goal If you can't SSH to Oracle Linux In…
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OCI: How to configure a secondary VNICs in OL7 Instance via oci-network-configApplies to: Oracle Cloud Infrastructure - Version N/A and later Information in this document applies to any platform. Goal This article illustrates how to use OCI utili…
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How to Change MTU SizeApplies To: Oracle Cloud Infrastructure - Version N/A and later Linux OS - Version Oracle Linux 6.0 and later Linux x86-64 Goal: This document details steps to change MT…
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Set up Secure VNC server in OCI Compute instancesApplies to: Oracle Cloud Infrastructure - Version N/A and later Information in this document applies to any platform. Goal Set up Secure VNC server in RHEL /Oracle Linux…
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Uptrack Service in Failed, Inactive, or Dead StateApplies to: Oracle Cloud Infrastructure - Version N/A to N/A [Release 1.0] Linux OS - Version Oracle Linux 7.0 and later Information in this document applies to any plat…
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Troubleshooting Unable to ssh Into an OCI instancePurpose There are a lot of potential causes for not being able to ssh in to an instance. The most common are outlined here. Troubleshooting Steps Issue 1: Security list …
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OCI - System don't finish the boot and stay in iSCSI error loopApplies to: Oracle Cloud Infrastructure - Version N/A and later Linux x86-64 Goal If the System don't complete the boot and as consequence stay inaccessible. In the cons…
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OCI - How to generate SSH key pair to access OCI instance?Applies to: Oracle Cloud Infrastructure - Version N/A and later Linux x86-64 Goal To generate ssh key pair for accessing the OCI instance. Solution There are two ways of…
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Permission denied (public key) during SSH login with opc userApplies to: Oracle Linux Cloud Service - Version Oracle Linux 6.0 and later Oracle Cloud Infrastructure Linux x86-64 Symptoms User gets a permission denied (public key) …
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Oracle Linux: 100% CPU Used By Abrt-hook-ccpp ProcessApplies to: Oracle Cloud Infrastructure - Version N/A and later Linux OS - Version Oracle Linux 7.0 to Oracle Linux 7.9 [Release OL7 to OL7U9] Linux x86-64 Symptoms Evid…
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OCI - How to Perform OCI CLI Offline InstallationApplies to: Oracle Cloud Infrastructure - Version N/A and later Linux OS - Version Oracle Linux 7.0 and later Linux x86-64 Goal This document details steps on how to per…
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How to Disable Daily "anacrontab" Mail AlertsApplies To: Oracle Cloud Infrastructure - Version N/A and later Linux x86-64 Goal: The goal of this article is to disable all mail alerts sent by "anacrontab" service da…
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"nstat -az" Causes High CPU Usage and Dies with "Aborted (core dumped)" MessagesApplies To: Oracle Cloud Infrastructure - Version N/A and later Linux x86-64 Symptoms: While running sos to collect an sosreport bundle, the machine may hang and generat… -
SSH Login Failed After Adding "AllowUsers" and "AllowGroups" Directives into /etc/ssh/sshd_configApplies To: Oracle Cloud Infrastructure - Version N/A and later Linux OS - Version Oracle Linux 6.0 and later Linux x86-64 Symptoms: SSH client like PuTTY can return a f…
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How to Install and Run Oracle Ksplice in (OCI)Applies To: Oracle Cloud Infrastructure - Version N/A to N/A [Release 1.0] Linux x86-64 Goal: Normally, Oracle Linux instances running platform images from OCI should al…
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How to Resize Root Partition of Oracle Linux Instance in OCIApplies To: Oracle Cloud Infrastructure - Version N/A to N/A [Release 1.0] Oracle Cloud Infrastructure Information in this document applies to any platform. Goal: To res…
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The Root Filesystem Turns Read-only With I/O errors On An OCI Instance Running Ubuntu 18.04An Oracle Cloud Infrastructure (OCI) Instance running Ubuntu 18.04 as its operating system experiences its root filesystem turning read-only with I/O errors. The root fi… -
Unable to Repair XFS Filesystem Using XFS RepairTo fix this error, run these commands: 1) Attempt to mount the partition to replay the log. Back up any important data on the partition if the attempted mount is possibl…
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SSH Session Disconnects After a Few Minutes of Inactivity When Using MobaXterm ClientUsers using the MobaXterm client can experience SSH connections automatically disconnecting due to inactivity. Enabling the SSH keepalive and Fix Connection issues in th…
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SSH Fails with error "Authentication Refused: Bad Ownership Or Modes For Directory /home/****"SSH connections to a linux instance fail for a user with "authentication refused: bad ownership or modes for directory" errors. This is caused by incorrect permissions b…
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SSH Login Stuck At : "debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP"SSH connections hang, and errors such as SSH2_MSG_KEX_DH_GEX_GROUP or SSH2_MSG_KEX_ECDH_REPLY are seen in verbose logging output or in /var/log/messages. When trying to …
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SSH Permission denied (publickey,gssapi-keyex,gssapi-with-mic) when using PuTTYGEN key files.Using PuTTYgen ssh keys with the OpenSSH ssh command on a linux system fails with Permission denied errors because it uses a different format than OpenSSH keys. Attempti…
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Logins to a Linux Instance Fail with "Fork: Retry: Resource Temporarily Unavailable" ErrorThe error Fork: Retry: Resource Temporarily Unavailable can occur if there is an error in /etc/security/limits.conf, or if a user account has exceeded any limits set for…
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How to Enable X11 Forwarding Over SSH on Oracle Linux 6 and 7The following instructions demonstrate how to enable X11 forwarding over SSH on systems running Oracle Linux 6 and 7, to display an X11 window on a different server. To …