Every day and night, the SSH login by key into my public accessible Oracle Cloud Infrastructure Linux Compute Instance was permitted for hours. And sometimes, when I had luck, it worked. For me it was not clear when it works and when not. But something has blocked me. The password authentification in the OCI Linux instance is basically disabled, the key is the only way to log in. After some investigation on the OCI instance, I found a huge amount of login trials in the /var/log/secure file. These brute force attacks were locking me out! Nov 4 03:57:24 instance-as-1 sshd[1975]: Received disconnect from 132.232.17.146 port 53924:11: Normal Shutdown, Thank you for playing [preauth] Nov 4 03:57:24 instance-as-1 sshd[1975]: Disconnected from 132.232.17.146…
Read MoreCategory: Oracle Linux
Oracle Cloud Infrastructure Storage Software Appliance – Installation and Configuration
The Oracle Cloud Infrastructure Storage Software Appliance – also known as Oracle Storage Cloud Software Appliance OSCSA – acts as a gateway between classic storage and the Oracle Cloud Infrastructure Object Storage Service. The appliance can be installed on an on-premises Linux system or in an Oracle Compute Cloud machine and runs in a Docker container. It offers a local cache where clients can place their files before the OSCSA moves them into the Storage Service. The communication between a client with a filesystem to the OSCSA works with NFSv4, from the OSCSA to the Object Storage Service, Oracle is using their REST interface. Traffic from the OSCSA to and from the Oracle cloud can be encrypted and compressed. In this blog post…
Read MoreOPatch 13.9 in EM13c – Say Goodbye to Unzip, Copy & Paste
Yesterday I wanted to apply a brand new patch to customer’s Enterprise Manager 13cR2 OMS running on Linux. First I updated the OMSPatcher as described here: How to upgrade the 13.1 Cloud Control OMSPatcher to latest version of OMSPatcher (Doc ID 2135028.1). This update was easy. Download, transfer, unzip and copy the OMSPatcher files to the Enterprise Manager ORACLE_HOME directory. Then the patch apply results in an error. OMSPatcher is based on OPatch, he needs an update too. We need a new OPatch Version This was error message for patch apply with omspatcher when I executed the apply command. [Dec 1, 2016 10:17:38 AM] Prerequisite check “CheckMinimumOPatchVersion” failed. The details are: The OPatch being used has version 13.8.0.0.0 while the…
Read MoreEnterprise Manager 13cR2 – How to apply Patch 23094292: WLS PATCH SET UPDATE 12.1.3.0.160719
My fresh EM13cR2 installation showed me that there is a patch for the Weblogic environment available. This patch was released in July 2016: Patch Patch 23094292: WLS PATCH SET UPDATE 12.1.3.0.160719. This patchset has included 157 fixes and is a generic one. The patch is marked in My Oracle Support as recommended. OPatch has no to be updated. This patch is not an online patch, you have to shut down your running EM13cR2 server. This blog post describes the apply of the Weblogic patch set update in an Enterprise Manager 13cR2 environment running on a Oracle Linux server. Prepare Patch Set Update on EM13c Server The patch file has to be extracted. I have copied to file to my EM13cR2…
Read MoreEnterprise Manager 13c – Let’s use the Hybrid Agent for Amazon EC2 and Azure Instances
I like the concept behind the Oracle Enterprise Manager Hybrid Cloud Architecture to connect my on-premise OMS with targets in the Oracle cloud. The Agent communicates via SSH tunnel to target servers, no other ports than SSH 22 are open against the world wide web. An I was interested to find out, if the installation of such an agent works for other cloud providers than Oracle too. Create a Oracle Linux Instance in Amazon AWS I have created a small Oracle Linux instance in Amazon AWS and inserted the public IP into the /etc/hosts file of the Oracle Management Server. Why I have used an Oracle Linux? According the documentation, at the moment only Oracle Linux x86-64 is supported to…
Read More