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alConfidenti
APPLICATION LOAD BALANCING CLUSTER USING OPEN SOURCE
Suvra Roy , RHCA VCP CEHSystem Administrator, BRAC.
Md. Salahuddin Rony , RHCE MTCNASr. System Administrator, BRAC.
BDSYSADMIN (BDSAF)
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WHY LOAD BALANCE?
Optimizing server utilization
- Queuing and throttling
Maximize availability
- No SPOF
Maximize throughput
- Distribute workload across a set of servers
Scalability
- Site traffic grows
- Add DB, Web servers to provide more
throughput
…
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REQUIRED COMPONENTS
HAProxy
K e e p a l i v e d
N g i n x / A p a c h e
P H P - F P M
M Y S Q L / M A R I A D B
G a l e r a C l u s t e r
G l u s t e r F S / S h a r e d S t o r a g e
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DEPLOYMENT SCENARIOS APACHE/NGINX
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HAPROXY GLOBAL CONFIGURATION
Configuration file
- Sections; global, defaults, frontend, backend, listen
- /etc/haproxy/haproxy.cfg
Global (process wide)
globallog 127.0.0.1 local2chroot /var/lib/haproxypidfile /var/run/haproxy.pidmaxconn 40000user haproxygroup haproxydaemonstats socket /var/lib/haproxy/stats.sock mode 600 level adminstats timeout 2m
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HAPROXY DEFAULT CONFIGURATION
Defaults Configuration :
defaults
mode tcp
log global
option dontlognull
option redispatch
retries 3
timeout queue 45s
timeout connect 5s
timeout client 1m
timeout server 1m
timeout check 10s
maxconn 400000
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HAPROXY FRONTEND & BACKEND CONFIGURATION
l is ten (frontend + backend)
frontend haproxy2
bind 0.0.0.0:3306
sql_backend galera-cluster
backend galera-cluster
mode tcp
balance leastconn
option tcplog
option httpchk
option mysql-check user haproxy
server db01 192.168.0.5:33306 check
server db02 192.168.0.6:33306 check
server db03 192.168.0.7:33306 check
listen http_web 0.0.0.0:80
mode http
balance roundrobin
option httpchk
option forwardfor
cookie SERVERID insert indirect nocache
server server1 192.168.0.2:8080 check cookie server1
server server2 192.168.0.3:8080 check cookie server2
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HAPROXY MONITORING & LISTEN CONFIGURATION
l is ten (stats ui)
listen haproxy-monitoring *:80
mode http
stats enable
stats show-legends
stats refresh 5s
stats uri /
stats realm Haproxy\ Statistics
stats auth monitoring:example
stats admin if TRUE
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Session rate
- number of new connections per second
10
Sessions
- current number of sessions/connections
LastChk
- health check
Wght
- server weight
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FAULT TOLERANCE FOR HAPROXY (CONT.)
keepalived configuration file
#/etc/keepalived/keepalived.conf
vrrp_script chk_haproxy {
-0 haproxy"script "killall
interval 2
weight 2
# verify the pid existence
# check every 2seconds
# adjust priority by this weight
}
vrrp_instance VI_1 {
interface eth0
state MASTER
virtual_router_id
priority 101
51 # ID for
# 101 on
# 100 on
this route
master
backup
# the virtual IP
virtual_ipaddress {
192.168.0.10
}
track_script {
chk_haproxy
}
}
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HAPROXY PERFORMANCE TUNING
# reuse TIME-WAIT sockets
65023 # increase max num of ports
#Increase
# Maximal
the number of outstanding syn requests
number of timewait sockets
Flood Protection
Flood Protection
T C P tuning
#/etc/sysctl.conf
net.ipv4.ip_nonlocal_bind=1
net.ipv4.tcp_tw_reuse=1
net.ipv4.ip_local_port_range=1024
net.ipv4.tcp_max_syn_backlog=40000
net.ipv4.tcp_max_tw_buckets=400000
net.ipv4.tcp_max_orphans=60000
net.ipv4.tcp_max_syn_backlog=40000
net.ipv4.tcp_synack_retries=3
net.core.somaxconn=40000
net.ipv4.tcp_fin_timeout=5
# TCP SYN
# TCP SYN
#
#
burst connection rate
how long to keep sockets in FIN-WAIT-2
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DEPLOYMENT SCENARIOS PHP-FPM
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DEPLOYMENT SCENARIOS MYSQL /MARIADB
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SUMMARY OF DEPLOYMENT
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THANK YOU!
For more Information contact us
Email : [email protected]
Email : [email protected]
