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Linux
Discussion List
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OCI how to enable http connectionSummary: I'm trying to enable HTTP connection to my compute instance without success. Content (required): I have enabled port 80 in ufw and added Ingress Rule to securit… -
Oracle Retail SIM support on OEL 7 or aboveSummary: IHAC whose currently running Oracle Retail SIM 13 version at on-premise and planning to migrate to OCI and would like to know the possible versions that can run… -
Upgrade ubuntu imageSummary: upgrade ubuntu Content (required): Version (include the version you are using, if applicable): Code Snippet (add any code snippets that support your topic, if a… -
Oracle Linux 8 grub error "kernel too small"Summary: OCI instance running OL8 with dnf-automatic configured to auto-upgrade the packages. Woke up one morning recently to find the instance not contactable. Cloud co… -
VNCServer Session Is Not Started on Oracle Linux InstanceAttempting to start a VNCServer session on an instance running Oracle Linux 7 or higher fails with either 'Internal error: Could not resolve keysym' or 'XIO: fatal IO er… -
PRESERVE_HOSTINFO=2 in /etc/oci-hostname.conf Does Not Stop /etc/resolv.conf From Being OverwrittenAn Oracle Linux instance has its /etc/resolv.conf files overwritten whenever it is rebooted or whenever its DHCP lease is renewed. In line with Oracle Cloud Infrastructu…
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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…
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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 …
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Does Oracle Linux Include Anti-Virus Software As Part Of Its Distribution?Some Operating Systems (OS) include their own anti-virus software as part of the OS distribution. However many Linux distributions, including Oracle Linux, do not includ…
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Installing And Running Oracle Ksplice in Oracle CloudThe uptrack tools necessary to run Oracle Ksplice in Oracle Cloud are included in the base image of Oracle Linux instances. These tools have names that start with 'uptra…
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How to Boot Oracle Linux 7 (OL7) Into Rescue And Emergency Modes Via 'systemd'In OL7, both rescue mode and emergency mode are systemd targets (that replace runlevels of previous OL versions). Note Rescue mode allows the system to be repaired in si…
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How To Create Additional Users on Linux Cloud Instances Running on Oracle Cloud Infrastructure (OCI)Linux instances running on OCI can have additional users added to them, with ssh access enabled so the additional users can log in remotely to the instances. If addition…
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How To Install Security Updates On Oracle Linux Using YUMIt is possible to use package management tools such as yum or dnf included in Oracle Linux to only install security updates, rather than applying all available updates t…
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How to Use the YUM Versionlock Plugin to Exclude Specific RPM Packages From Being UpgradedThere are instances where specific versions of an application or driver RPM package may have dependencies on specific kernel versions. In situations like this, you can u…
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How to Connect Through VNC Using the Public IP Address of an Oracle Linux 7 Instance on OCIThis article explains how to configure VNC to connect to an Oracle Linux 7 instance via the instance's public IP address on OCI. 1) Install graphical user interface (GUI…
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How To Collect a Sos ReportA sos report can be collected on systems running Oracle Linux or Red Hat Linux in order to obtain system configuration information and logs. If the sos package, which pr…
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How To Install The Sosreport PackageA sosreport collects diagnostic support data from Oracle Linux or RHEL. To install it, install the sos package. Check to see if the 'sos' package is installed, as it pro…
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How to Check and Repair EXT3/EXT4 Filesystem on Oracle LinuxThe fsck command can be used to check and repair the ext3 and ext4 file systems. This article describes the steps needed to run this command on both these types of file …
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How to Bring up Secondary VNICs in an Oracle Cloud Infrastructure(OCI) Oracle Linux 7 InstanceHow to add a secondary VNIC that is persistent through reboots in OL7 using systemd Unit File 1. Use the OCI Web Console to create and attach a secondary VNIC, see: http…
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How To Set Device Name Using UDEV on Oracle Linux 7.XCustom disk names can be used to make it easier to identify specific storage and how it is being used, such as for ASM storage. A udev rule needs to be created to set a …
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How To Create a Swap File to Increase Swap Memory On OCI Linux InstancesHow to increase the amount of swap space on a Linux system by creating a new swap file. Use root user privileges when running any commands in the following steps. Note C…
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How To Set SELinux to Permissive ModeSELinux can be set in permissive mode where it will still be running but won't be actively enforcing SELinux policy. This article explains how to set SELinux to run in p…
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How To Connect To An OCI Linux Instance Using SSH Password Authentication Instead Of SSH KeysHow to use password based authentication instead of ssh keys to log into a Linux OCI or OCI-C instance. Note SSH key-pair authentication is more secure than password-bas…
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How to change the primary VNICHI all as asked early i think that the only way to change the primary vnic from a vnc to another is deleting the instance an recreate a new instance using the boot volum…