Also the configuration file I was referring to in the previous email is not the haproxy config. it is a different file that contains some json configs. Sorry for the confusion.
On Wed, May 26, 2021 at 8:14 PM reshma r <[email protected]> wrote: > Hi, thank you for the quick response > @Chipitsine This is where I read the recommendation: > https://www.haproxy.com/blog/5-ways-to-extend-haproxy-with-lua/ - > (search for register_init > in this). > > @Lukas > >> Are you talking about writing to the filesystem from a LUA scripts or > other runtime code within haproxy? > > Yes, this was what I was trying to do. I wanted to update the file from > within haproxy action. Thank you for the clarification. > > >>Explaining what the problem is you are trying to solve can get you > more accurate proposals and solutions faster than asking about a > particular solution (XY problem). > Sorry for the lack of detail. It is a bit complicated but I will try to > explain. I am routing some data through spoe filter to an endpoint > for analysis and the data to be sent is determined by reading the > configuration file (for example-whether a certain value is to be sent or > not). There is a requirement that the configuration file may be changed > from an external portal. So whenever a change is made in the portal I would > like to update my configuration file accordingly. To do this, I am making a > socket call which periodically checks whether the portal has been changed > (from within haproxy action). If so I must write the updated values to the > file and it seems I cannot write to a file inside lua action so this is > where I am stuck. To me, It sounds like this cannot be achieved and I must > drop the idea of changing the file from the portal. > > Thank you. > > On Wed, May 26, 2021 at 6:47 PM Lukas Tribus <[email protected]> wrote: > >> Hello, >> >> On Wed, 26 May 2021 at 13:29, reshma r <[email protected]> wrote: >> > >> > Hello all, >> > Periodically I need to write some configuration data to a file. >> > However I came across documentation that warned against writing to a >> file at runtime. >> > Can someone give me advice on how I can achieve this safely? >> >> You'll have to elaborate what you are talking about. >> >> Are you talking about writing to the filesystem from a LUA scripts or >> other runtime code within haproxy? Then yes, don't do it, it will >> block the event loop and you will be in a world of hurt. >> Are you talking about writing and changing the configuration file, >> prior to a reload, manually or from a external process, that's not a >> problem at all. >> >> The issue is blocking filesystem access in the event-loop of the >> haproxy process itself. >> >> Explaining what the problem is you are trying to solve can get you >> more accurate proposals and solutions faster than asking about a >> particular solution (XY problem). >> >> >> Lukas >> >
