Category Archives: DataCenter

#nginx proxy_pass an URI to another server with a different URI

By | August 22, 2017
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Nginx can be used very nicely to aggregate resources after the same fronted by using it as a proxy. I want my set-up to be like: URL1: https://blog.voina.org -> nas1 hosted wordpress URL2: https://blog.voina.org/store -> nas2 hosted store with URL https://nas/store URL3: https://blog.voina.org/doc -> nas4 hosted wiki with URL https://nas4/wiki How can we do this… Read More: #nginx proxy_pass an URI to another server with a different… »

#DRBD: Synchronization of sites after the connection between sites is down for a long time

By | August 10, 2017
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In a DRBD setup as described in #DRBD based disk replication of a production cluster to a remote site cluster on RHEL 6 there is a special case when due to some external issues the communication line between the sites is down due to technical reason for a longer period of time (days). The line… Read More: #DRBD: Synchronization of sites after the connection between sites is… »

Validate and Investigate a live #DRBD replicated Oracle Instance using LVM clone

By | October 19, 2017
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This is another post related to the DRBD replication setup I describe in post #DRBD based disk replication of a production cluster to a remote site cluster on RHEL 6. Sometimes we need to be able to mount the offline replicated Oracle database instance for investigations. This can be done by using logical volume snapshots.… Read More: Validate and Investigate a live #DRBD replicated Oracle Instance using… »

Hidden Oracle dependencies when running under #Docker on Fedora/CentOS/RedHat Linux

By | June 28, 2017
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There are some hidden dependencies of running oracle database in a docker container under Fedora/CentOS/RedHat Linux. STEP 1: Kernel parameters Because the Oracle engine from the Docker container uses in fact the kernel of the host machine we cannot escape the need to set up some kernel parameters on the host. On the host machine… Read More: Hidden Oracle dependencies when running under #Docker on Fedora/CentOS/RedHat Linux »

#SMB Breaking News: #HPE #MicroServer Gen10

By | June 12, 2017
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Finally a new release of the HPE MicroServer updated at the new generation Gen10. HPE ProLiant MicroServer Gen10 It seems that the Gen8 release of the MicroServer was so successful (I am the proud owner of 3 HP MicroServer Gen8) that HPE never released a Gen9 model. What are the main updates after a quick… Read More: #SMB Breaking News: #HPE #MicroServer Gen10 »

Linux: Save a pdf presentation to individual image slides

By | May 26, 2017
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There is a very simple way to save a pdf presentation to individual jpeg images of the slides using convert. convert -density 300 presentation.pdf presentation_page_%04d.jpg where: – density 300 specifies the DPI used to read the pdf. – presentation_page_%04d.jpg is a name pattern for the saved images As a result if presentation has 20 slides… Read More: Linux: Save a pdf presentation to individual image slides »