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.IX Title "Perlbal::Manual::FailOver 3pm"
.TH Perlbal::Manual::FailOver 3pm "2022-06-28" "perl v5.34.0" "User Contributed Perl Documentation"
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.SH "NAME"
Perlbal::Manual::FailOver \- Fail Over mechanism in Perlbal
.SS "\s-1VERSION\s0"
.IX Subsection "VERSION"
Perlbal 1.78.
.SS "\s-1DESCRIPTION\s0"
.IX Subsection "DESCRIPTION"
How Perlbal's Fail Over mechanism works.
.SS "Fail Over"
.IX Subsection "Fail Over"
Whenever Perlbal fails to open a connection to a machine, it assumes that machine is not available and spreads the load between the remaining servers. It keeps trying to open connections to that server according to \f(CW\*(C`error_retry_schedule\*(C'\fR.
.PP
If there are no available servers, Perlbal will keep trying to open connections to the servers until \f(CW\*(C`idle_timeout\*(C'\fR is reached, upon which it will close the connection to the user. Clients interpret that closing differently: most will assume a 500 \s-1HTTP\s0 code, a few assume a 200 \s-1OK\s0 with empty content.
.PP
For more information on parameters \f(CW\*(C`idle_timeout\*(C'\fR and \f(CW\*(C`error_retry_schedule\*(C'\fR see Perlbal::Manual::ReverseProxy.
.SS "\s-1SEE ALSO\s0"
.IX Subsection "SEE ALSO"
Perlbal::Manual::LoadBalancer,
Perlbal::Manual::ReverseProxy.