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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… -
"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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OCI: How to Use Boot Volumes for Oracle Linux Instance RecoveryApplies to: Oracle Linux Cloud Service - Version Oracle Linux 6.0 and later Oracle Cloud Infrastructure Linux x86-64 Goal If an Oracle Linux instance in OCI is not booti…
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Hanging Connection While Accessing On-Premise CIFS from Oracle Cloud Instance (OCI) Linux InstanceA user is experiencing connections hanging when connecting from OCI to an on-premise file share via a CIFS mount. Trying to access files on the CIFS mount may fail with … -
Logging In to a Linux Host Using SSH Prompts "reverse mapping checking getaddrinfo failed" ErrorWhen trying to log in via ssh from one linux host to a different linux host, the following error occurs: host1 ~]# ssh reverse mapping checking getaddrinfo for host2. […
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Curl Command Returns Error "SSL Certificate Problem: Unable To Get Local Issuer Certificate"SSL Certificates are checked when using applications, such as curl, to connect to web servers. If this check fails, errors such as "unknown CA" and "SSL certificate prob…
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How to Configure a Relay Host in Sendmail "Smart Host" On Oracle Linux 6 and 7Sendmail is a standard Linux OS mail delivery service. A Relay Host can be configured with Sendmail's "Smart Host" option using the following steps: Install the sendmail…
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Yum Update Fails With Error "mdmadm-4.1-8.0.1.el7_9.x86_64: failed to retrieve package"When trying to perform an update on an OCI Instance running Oracle Linux 7, the update fails with the following error: Error downloading packages: mdadm-4.1-8.0.1.el7_9.…
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Using SSH and Client-side Config with Oracle Linux 8The following video explains how to use SSH and Client-side config with Oracle Linux 8:
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ASLR is Disabled on an Oracle Linux 7 Cloud InstanceIn standard Oracle Linux 7 OCI instances, ASLR is enabled by default and the corresponding kernel parameter is set to kernel.randomize_va_space = 2 ASLR is a feature of …
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Oracle Linux 7 Cloud Instance Experiences Hangs with Kernel Error "detected conn error (1020)"An Oracle Linux 7 Cloud instance using iSCSI storage, started to experience many OS commands, such as ps or df hanging. The instance logs showed that the iscsid service …
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How to Change MTU Size on Oracle Linux 6 and 7TCP based networks send data in packets via network interfaces. The Maximum Transmission unit (MTU) set on a network device defines the maximum size of a single packet t…