HAProxy
우분투 20.04 에서 진행한다. 패키지관리자로 설치가 가능하다. SSL을 지원하는 2.x 버전이 설치된다.
apt install -y haproxyroot@haproxy1:~# haproxy --version
HA-Proxy version 2.0.29-0ubuntu1 2022/08/26 - https://haproxy.org/
Usage : haproxy [-f <cfgfile|cfgdir>]* [ -vdVD ] [ -n <maxconn> ] [ -N <maxpconn> ]
[ -p <pidfile> ] [ -m <max megs> ] [ -C <dir> ] [-- <cfgfile>*]
-v displays version ; -vv shows known build options.
-d enters debug mode ; -db only disables background mode.
-dM[<byte>] poisons memory with <byte> (defaults to 0x50)
-V enters verbose mode (disables quiet mode)
-D goes daemon ; -C changes to <dir> before loading files.
-W master-worker mode.
-Ws master-worker mode with systemd notify support.
-q quiet mode : don't display messages
-c check mode : only check config files and exit
-n sets the maximum total # of connections (uses ulimit -n)
-m limits the usable amount of memory (in MB)
-N sets the default, per-proxy maximum # of connections (0)
-L set local peer name (default to hostname)
-p writes pids of all children to this file
-de disables epoll() usage even when available
-dp disables poll() usage even when available
-dS disables splice usage (broken on old kernels)
-dG disables getaddrinfo() usage
-dR disables SO_REUSEPORT usage
-dr ignores server address resolution failures
-dV disables SSL verify on servers side
-sf/-st [pid ]* finishes/terminates old pids.
-x <unix_socket> get listening sockets from a unix socket
-S <bind>[,<bind options>...] new master CLIhaproxy 설정
파일을 생성하거나 수정해야 한다. 각 HAProxy 노드별로 설정파일이 같다.
/etc/haproxy/haproxy.cfg
global
log /dev/log local0
log /dev/log local1 notice
chroot /var/lib/haproxy
stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
stats timeout 30s
user haproxy
group haproxy
daemon
# Default SSL material locations
ca-base /etc/ssl/certs
crt-base /etc/ssl/private
# See: https://ssl-config.mozilla.org/#server=haproxy&server-version=2.0.3&config=intermediate
ssl-default-bind-ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
ssl-default-bind-ciphersuites TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256
ssl-default-bind-options ssl-min-ver TLSv1.2 no-tls-tickets
defaults
log global
mode http
option httplog
option dontlognull
timeout connect 5000
timeout client 50000
timeout server 50000
errorfile 400 /etc/haproxy/errors/400.http
errorfile 403 /etc/haproxy/errors/403.http
errorfile 408 /etc/haproxy/errors/408.http
errorfile 500 /etc/haproxy/errors/500.http
errorfile 502 /etc/haproxy/errors/502.http
errorfile 503 /etc/haproxy/errors/503.http
errorfile 504 /etc/haproxy/errors/504.http
listen stats
bind *:8080
stats enable
stats uri /
stats realm HAProxy\ Statistics
stats auth admin:1234
stats refresh 10s
frontend mysql-front
bind *:3306
mode tcp
default_backend mysql-back
backend mysql-back
mode tcp
option mysql-check user haproxy
balance roundrobin
server db1 172.16.0.20:3306 check
server db2 172.16.0.21:3306 check backup weight 2
server db3 172.16.0.22:3306 check backup weight 1이 설정은 db1 노드를 Active 상태로 두고 나머지는 stand-by한다. db1 노드에 장애가 발생하면 다음번 노드가 활성화된다.
mysql-check 옵션
백엔드에 입력된 노드상태 확인을 위해서 mysql 접근이 가능해야한다. 따라서 각 데이터베이스 노드에 haproxy 유저를 추가해준다.
MariaDB [(none)] > create user 'haproxy'@'172.16.0.%';Keepalived
HAProxy를 이중화하기 위해서 keepalived가 필요하다. VIP를 가지고 있다가 마스터 노드에 장애가 발생하면 슬래이브 노드에 VIP를 바인딩해준다.
apt install -y keepalived로컬 호스트주소외 다른 가상아이피를 바인딩할 수 있도록 설정을 변경해야 한다.
아래파일에 추가하거나 수정한다.
/etc/sysctl.conf
net.ipv4.ip_nonlocal_bind = 1root@haproxy1:/etc/keepalived# sysctl -p
net.ipv4.ip_nonlocal_bind = 1
HAProxy 1번노드
/etc/keepalived/keepalived.conf
global_defs {
router_id HAProxy1
}
vrrp_script check_haproxy {
script "killall -0 haproxy"
interval 2
weight 2
}
vrrp_instance VIS_TEST {
interface eth0
state MASTER
priority 101
virtual_router_id 51
advert_int 1
virtual_ipaddress {
172.16.0.5
}
track_script {
check_haproxy
}
}
HAProxy 2번노드
/etc/keepalived/keepalived.conf
global_defs {
router_id HAProxy2
}
vrrp_script check_haproxy {
script "killall -0 haproxy"
interval 2
weight 2
}
vrrp_instance VIS_TEST {
interface eth0
state MASTER
priority 100
virtual_router_id 51
advert_int 1
virtual_ipaddress {
172.16.0.5
}
track_script {
check_haproxy
}
}
router_id 값은 각 노드마다 다르다.
priority 값은 마스터가 값이 더 커야 한다.
virtual_ipaddress 값은 VIP로 마스터가 이 VIP를 바인딩하다 장애가 발생하면 다른 노드가 이 VIP를 바인딩해서 이중화가 가능하다.
서비스 재시작
systemctl restart keepalived.service네트워크 확인
1번 노드에 VIP가 바인딩된 것이 보인다. 1번노드에서 haproxy 서비스를 중지시키면 2번 노드에 VIP가 바인딩되는 것을 확인할 수 있다.
root@haproxy1:/etc/haproxy# ip a
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
inet 172.16.0.10/24 brd 172.16.0.255 scope global eth0
valid_lft forever preferred_lft forever
inet 172.16.0.5/32 scope global eth0
valid_lft forever preferred_lft forever
root@haproxy2:/etc/haproxy# ip a
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
inet 172.16.0.11/24 brd 172.16.0.255 scope global eth0
valid_lft forever preferred_lft forever
