I want to reload the mosquitto password file when it is changed.
Is possible to send SIGHUP ("signal hang up") or some equivalent to mosquitto server on windows?
It is possible to do so. First you have to set your mosquitto.conf to save the pid in a file by specifying the pid_file.
pid_file your/pid/file
Then you can call
$kill -SIGHUP $(cat your/pid/file).
Or else if you already know the PID of the mosquitoo, then you can do
$kill -SIGHUP PID
This will send sighup signal and reload the pwfile. More info can be found at mosquitto conf
Since I found this thread looking for an answer on Linux I think this reply is relevant for some.
I think I found a simplified version of dulaj's answer (for Linux). If you look at /etc/init.d/mosquitto (found on Mosquitto v.31) you'll see there is a "reload" option which has adds "--signal HUP" to the start-stop-daemon and it listed as "Reloading network daemon configuration: mosquitto".
So you should be able to run "sudo service mosquitto reload"
I don't think you can, but you could use the mosquitto-auth-plugin which allows you to keep the ACL in a database that you can update while mosquitto is running.
This lets you a range of different database backends and you can add, remove, change ACL and users on the fly.
As of version 1.5 of Mosquitto, you can signal the named event mosq<pid>_reload (the relevant code change).
Sample code:
auto h = OpenEvent(EVENT_MODIFY_STATE, FALSE, "mosq0000_reload");
SetEvent(h);
Example to get the pid in Windows can be found at https://learn.microsoft.com/en-us/windows/win32/psapi/enumerating-all-processes.
Related
Attempting to kill port and locate possible process paths
I'm trying to use the Postgres.app to utilize the database, but keep running into the "Port in use" issue. I had originally brew installed postgres, but opted to use the app instead. So I brew removed postgres and installed Postgres.app. But now when I try to connect, it says that the port is in use. From everything that I've read, postgresql is the only process that listens at that port (I'm not using any other databases like MySQL). So, I was going to try to use the sudo launchctl unload -w /path_to/process command, but as you can see above...when I use which postgres or which postgresql, there's no path found. I also tried killing the connection to the port, but the ghost postgresql automatically connects right afterwards. Any tips on how to find out what the heck is listening on the port and prevent it from auto-connecting?
Edit: I tried using the Activity Monitor to see if I had accidentally installed a second version of the postgres.app. I checked to see what was the PID of the process listening in on the port. But it's not listed in the activity monitor. So I still have no idea how to find whatever is listening on the port
PID not listed in Activity monitor screen
Could anybody help me how to shutdown elasticSearch completely ! It starts automatically when system starts.
Yes, it should because you are initialing it in the config file, which fires every time the system starts.
To answer your question, I believe this answer should help.
It probably runs as a service. If it is on linux remove the service file, usually on /etc/init.d/elasticsearch
If it is on windows - there is a service.bat file on the installation/bin folder, you can uninstall using:
service.bat remove
If you are using Ubuntu 15.04+
systemctl disable elasticsearch
For Ubuntu < 15.04
To toggle a service from starting or stopping permanently you would need to:
echo manual | sudo tee /etc/init/SERVICE.override
where the stanza manual will stop Upstart from automatically loading the service on next boot. Any service with the .override ending will take precedence over the original service file. You will only be able to start the service manually afterwards. If you do not want this then simply delete the .override.
For more details, you may check this
I need to change the server_name of a running rethinkdb instance. I have stopped the server and update the /etc/rethinkdb/instances.d/default.conf file and then removed the metadata & rethinkdb_data from /var/lib/rethinkdb/default/data location. Finally when i executed the rethinkdb --config-file /etc/rethinkdb/instance.d/default.conf it shows that server is ready but didn't came back to bash shell prompt.
Can someone clarify on this.
Thanks in advance.
To start the rethinkdb daemon in the background, use:
/etc/init.d/rethinkdb start
It will automatically read the configuration file in /etc/rethinkdb/instance.d/default.conf
I have a PHP script that modifies my httpd.conf file, so I need to automatically reload it in Apache.
On Linux, there is graceful restart, but on Windows (I use the restart command) it terminates all the current connections. Is there a command as graceful restart on Windows? Is there a workaround on this?
Yes, you should use the -k switch.
httpd.exe -k restart or apache.exe -k restart
More info here has well. http://www.zrinity.com/developers/apache/usage.cfm
Edit:
It shouldn't that is the point of Graceful. Notice I used the -k. That is not the same as a normal restart. It let's the current sessions complete their task while the config is being reread, so that it will start taking new requests immediately.
From the documentation:
The USR1 or graceful signal causes the parent process to advise the children to exit after their current request (or to exit immediately if they're not serving anything). The parent re-reads its configuration files and re-opens its log files. As each child dies off the parent replaces it with a child from the new generation of the configuration, which begins serving new requests immediately.
http://httpd.apache.org/docs/2.2/stopping.html#graceful
It's doing what you are asking for.
Edit 2:
Adding this link and gave both possible versions because some people think you there is only one specific way to do something instead of search themselves.
http://httpd.apache.org/docs/2.4/platform/windows.html#wincons
I think I'm just going to delete this answer because either people can't read or if it doesn't work for someone it gets a DV. There are different windows versions made by different developers. If it doesn't work look for the answer from them. Even Linux has different commands depending on the distro. geez
In the newest Apache 2.4.20 VC10 the "httpd -k restart" command actually DOES do a graceful restart. It won't drop any connections, for example if somebody is downloading something from your server, it WILL NOT interrupt this process. One more proof is that "-k restart" will not reset your server statistics that mod_status provides, won't even alter the "Restart Time" value.
Although "httpd -k graceful" and "httpd -k graceful-stop" commands are available in Windows, but they will not work giving an error "couldn't make a socket".
I am trying to build and install membase from source tarball. The steps I followed are:
Un-archive the tar membase-server_src-1.7.1.1.tar.gz
Issue make (from within the untarred folder)
Once done, I enter into directory install/bin and invoke the script membase-server.
This starts up the server with a message:
The maximum number of open files for the membase user is set too low.
It must be at least 10240. Normally this can be increased by adding
the following lines to /etc/security/limits.conf:
Tried updating limits.conf as suggested, but no luck it continues to pop up the same message and continues booting
Given that the server is started I tried accessing memcached over port 11211, but I get a connection refused message. Then figured out (netstat) that memcached is listening to 11210 and tried telneting to port 11210, unfortunately the connection is closed as soon as I issue the following commands
stats
set myvar 0 0 5
Note: I am not getting any output from the commands above {Yes: stats did not show anything but still I issued set.}
Could somebody help me build and install membase from source? Also why is memcached listening to 11210 instead of 11211?
It would be great if somebody could also give me a step-by-step guide which I can follow to build from source from Git repository (I have not used autoconf earlier).
P.S: I have tried installing from binaries (debian package) on the same machines and I am able to successfully install and telnet. Hence not sure why is build from source not working.
You can increase the number of file descriptors on your machine by using the ulimit command. Try doing (you might need to use sudo as well):
ulimit -n 10240
I personally have this set in my .bash_rc so that whenever I start my terminal it is always set for me.
Also, memcached listens on port 11210 by default for Membase. This is done because Moxi, the memcached proxy server, listens on port 11211. I'm also pretty sure that the memcached version used for Membase only listens for the binary protocol so you won't be able to successfully telnet to 11210 and have commands work correctly. Telneting to 11211 (moxi) should work though.