Hi I've setup a 3 node elasticsearch cluster on different VMs locally on my laptop.
I use haproxy for loadbalancing.
Connecting curl or kibana against the loadbalancer works fine, but logstash's monitoring pipeline is giving errors. I did not test with the real pipeline yet.
Looks for me as if logstash wants to keep the connection open but with haproxy in the chain the connection gets closed and logstash seems not to recognize the closure correctly (or it is not forwarded to logstash correctly). So it hits an error and after a while it reconnects again.
I hope anyone of you is using haproxy in front of elasticsearch's rest api and you can provide your configuration. I am new to haproxy.
Mine looks like this:
global
log 127.0.0.1 local2 debug
log 127.0.0.1 local0 debug
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
stats socket /var/lib/haproxy/stats
tune.ssl.default-dh-param 2048
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
frontend ft_elasticsearch_http
mode tcp
option tcpka
option tcplog
bind 0.0.0.0:9201 name elasticsearch_http
default_backend bk_elasticsearch_http
backend bk_elasticsearch_http
mode tcp
option httpchk HEAD / HTTP/1.1\r\nAuthorization:\ Basic\ aGVhbHRoY2hlY2s6aGVhbHRoMQ==
http-check expect status 200
option tcpka
option tcplog
default-server fall 2
balance source
option log-health-checks
default-server inter 1s fall 2
#server elastic03.internal.de_9200 elastic03.internal.de:9200 check check-ssl verify required ca-file /etc/haproxy/certs/ca/elasticsearch/elastic.pem inter 2s
#server elastic02.internal.de_9200 elastic02.internal.de:9200 check check-ssl verify required ca-file /etc/haproxy/certs/ca/elasticsearch/elastic.pem inter 2s
server elastic01.internal.de_9200 elastic01.internal.de:9200 check check-ssl verify required ca-file /etc/haproxy/certs/ca/elasticsearch/elastic.pem inter 2s
When I wireshark the connection without loadbalancer in the chain, I can see tcp keepalives, but with haproxy in between, I don't see any.
Thanks a lot, Andreas