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chara:restarting_servers [2017/06/29 20:33]
127.0.0.1 external edit 		chara:restarting_servers [2018/07/05 10:55]
jones
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-====== **Restarting Servers using the bootlaunch paradigm** ======+======Restarting Servers using the bootlaunch paradigm======
 \\  A number of servers use an interim bootlaunch paradigm to restart. This is confined to servers that run on ubuntu machines, namely the telescope bunker computers and gps. The basic syntax is "bootlaunch_<server>" where "<server>" is replaced by the server the script is designed to address. The scripts have a number of safeties built in, so it is safe to run them even if a server is already running -- they just output the process ID of the running server. This scripts also take care of the entry in socket manager as well any serial port lock files. All the pertinent information is world writable, so one should be able to run a bootlaunch script as observe.\\ \\  One thing of note about the output of the bootlaunch scripts, they call a number of other programs which themselves have output that may be misleading in the context of bootlaunch. Chief among these is the output of "tsockman". If a server stopped unexpectedly, it may leave behind an entry in the socket manager. In order to launch a new server, one needs to clean out the socket manager entry if it is there. To do that, "tsockman remove <entry>" is called to remove "<entry>" before the new server is launched. If there is no entry, tsockman will respond with "Process by that name does not exist". THIS IS NORMAL and is not indicative of an error. The server in question launched (without fanfare) right after that output text.\\ \\  Here are the available bootlaunch scripts as of June 2017:\\ \\  gps computer:\\ \\  \\  A number of servers use an interim bootlaunch paradigm to restart. This is confined to servers that run on ubuntu machines, namely the telescope bunker computers and gps. The basic syntax is "bootlaunch_<server>" where "<server>" is replaced by the server the script is designed to address. The scripts have a number of safeties built in, so it is safe to run them even if a server is already running -- they just output the process ID of the running server. This scripts also take care of the entry in socket manager as well any serial port lock files. All the pertinent information is world writable, so one should be able to run a bootlaunch script as observe.\\ \\  One thing of note about the output of the bootlaunch scripts, they call a number of other programs which themselves have output that may be misleading in the context of bootlaunch. Chief among these is the output of "tsockman". If a server stopped unexpectedly, it may leave behind an entry in the socket manager. In order to launch a new server, one needs to clean out the socket manager entry if it is there. To do that, "tsockman remove <entry>" is called to remove "<entry>" before the new server is launched. If there is no entry, tsockman will respond with "Process by that name does not exist". THIS IS NORMAL and is not indicative of an error. The server in question launched (without fanfare) right after that output text.\\ \\  Here are the available bootlaunch scripts as of June 2017:\\ \\  gps computer:\\ \\ 
  
chara/restarting_servers.txt ยท Last modified: 2018/07/05 10:55 by jones

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