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The Lounge What is on Your Mind? Cut Over to New Data Center and Upgraded OS Done. :) Post 303022861 by bakunin on Saturday 8th of September 2018 04:42:57 PM
Old 09-08-2018
Great job, Neo! Kudos for the smoothness of the transition.

Quote:
Originally Posted by Aia
Does it still make sense for you to be tied down to a private data center instead public cloud? I am curious.
Funny, i had just this discussion with a customer of mine: usually i work for banks and other large corporations with datacenters of several hundreds or thousands of (virtualised) servers. This time my customer is a relatively small company with about 50 servers (not virtualised by now) and the job is to transfer the whole datacenter to a new location (another town actually) and introduce virtualisation on the way.

Their first ideas when we had the kick-off work shop were the typical buzzword-bingo: cloud ... blabla ... software storage ... blabla ... Nutanics ... platform as a service ..., etc.

Then i asked a few questions: turns out, they have no idea what a "cloud" is and in fact what they really need is a reliable DevOps system. Their most prominent use case is: they need a test (development, ...) environment for one of their production servers and they want to more or less automatically deploy it. This is exactly what a DevOps system can help you with. My suggestion was to introduce Ansible but also reorganise their environment so that industrialisation and standardisation takes place. No more "hand-crafted one-of-a-kind" server systems but standardised machines with a standardised setup that is easily replicateable.

Next question: their most valuable asset is a large corporate database with a CRM system on top. Do you want to have that somewhere in the internet?
A: "Ah, but we can put a clause regarding this in the contract!"
Q: "Yes - and when this is breached (as has happened to some in the past) you get some refund but the trust of your customers to give you any data is NIL, never to return again and your business model is therefore dead. How much refund do you need to cover for that?"

Cloud services are nice when you need systems for testing for a limited amount of time and you don't want to hold the hardware resources for this. If you need a system to test your new database with meaningless test data then Amazon cloud, Microsoft Azure or whatever else you prefer is for you. If you need a reliable productive system you better have control over every clock cycle the underlying machine offers.

bakunin

Last edited by bakunin; 09-08-2018 at 05:49 PM..
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FS_NEWCELL(1)						       AFS Command Reference						     FS_NEWCELL(1)

NAME
fs_newcell - Changes the kernel-resident list of a cell's database servers SYNOPSIS
fs newcell -name <cell name> -servers <primary servers>+ [-linkedcell <linked cell name>] [-help] fs n -n <cell name> -s <primary servers>+ [-l <linked cell name>] [-h] DESCRIPTION
The fs newcell command removes the Cache Manager's kernel-resident list of database server machines for the cell specified by the -name argument and replaces it with the database server machines named by the -servers argument. Each time the machine reboots, the Cache Manager constructs the kernel list of cells and database server machines by reading the local /etc/openafs/CellServDB file. This command does not change the CellServDB file, so any changes made with it persist only until the next reboot, unless the issuer also edits the file. The output of the fs listcells command reflects changes made with this command, because that command consults the kernel-resident list rather than the CellServDB file. This command can introduce a completely new cell into the kernel-resident list, but cannot make a cell inaccessible (it is not possible to remove a cell's entry from the kernel-resident list by providing no values for the -server argument). To make a cell inaccessible, remove its entry from the CellServDB file and reboot the machine. If the -name argument names a DCE cell, then the -servers argument names DFS Fileset Location (FL) Server machines. The -linkedcell argument specifies the name of the AFS cell to link to a DCE cell for the purpose of DFS fileset location. CAUTIONS
Some commands, such as the aklog or klog.krb5 commands, work correctly only when the information is accurate for a cell in both the CellServDB file and the kernel-resident list. OPTIONS
-name <cell name> Specifies the fully-qualified cell name of the AFS or DCE cell. -servers <primary servers>+ Specifies the fully-qualified hostnames of all AFS database server machines or DFS Fileset Location (FL) Server machines for the cell named by the -name argument. If FL Server machines are specified, the local machine must be running the AFS/DFS Migration Toolkit Protocol Translator. -linkedcell <linked cell name> Specifies the name of the AFS cell to link to a DCE cell for the purpose of DFS fileset location. -help Prints the online help for this command. All other valid options are ignored. EXAMPLES
The following example changes the machine's kernel-resident list of database server machines for the ABC Corporation cell to include the machines "db1.abc.com" and "db2.abc.com": % fs newcell -name abc.com -servers db1.abc.com db2.abc.com The following example links the DCE cell "dce.abc.com" to the AFS cell "abc.com". The AFS client contacts the Fileset Location (FL) servers "db1.dce.abc.com" and "db2.dce.abc.com" for fileset location information as it interprets a DFS pathname. % fs newcell -name dce.abc.com -servers db1.dce.abc.com db2.dce.abc.com -linkedcell abc.com PRIVILEGE REQUIRED
The issuer must be logged in as the local superuser root. SEE ALSO
CellServDB(5), fs_listcells(1) COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved. This documentation is covered by the IBM Public License Version 1.0. It was converted from HTML to POD by software written by Chas Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell. OpenAFS 2012-03-26 FS_NEWCELL(1)
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