LVS负载均衡DR模式+keepalived
实验拓扑：实验准备：
CentOS6.5-x86-64
node1 10.0.0.11 软件：ipvsadm+keepalived 角色：Director1
node2 10.0.0.12 软件：ipvsadm+keepalived 角色：Director2
node3 10.0.0.13 软件：nginx 角色：Realerver1
node4 10.0.0.14 软件：nginx 角色：Realerver2
一、在两台Director上安装配置ipvsadm和keepalived
1、安装ipvsadm
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# yum install ipvsadm -y
# ipvsadm -v
ipvsadm v1.26 2008/5/15 (compiled with popt and IPVS v1.2.1)
2、安装keepalived
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# sh hm-keepalived-install.sh（keepalived安装脚本）
#!/bin/bash
kernel=/usr/src/kernels/$(uname -r)
yum install gcc gcc-c++ pcre-devel openssl-devel popt-devel libnl-devel libnfnetlink libnfnetlink-devel -y
[ -e keepalived-1.2.23.tar.gz ] || wget http://www.keepalived.org/software/keepalived-1.2.23.tar.gz
tar -zxf keepalived-1.2.23.tar.gz && cd keepalived-1.2.23 &&
./configure --prefix=/usr/local/keepalived --sysconf=/etc --with-kernel-dir=${kernel}
make && make install
chkconfig --add keepalived && chkconfig keepalived on
ln -s /usr/local/keepalived/sbin/keepalived /usr/sbin/
三、在两台Realserver上安装配置nginx
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# sh hm-nginx-install.sh（nginx安装脚本，只需将nginx源码包放到/usr/local/src目录下，执行即可）
#!/bin/bash
nginx_s=/usr/local/src/nginx-1.8.1.tar.gz
nginx_v=nginx-1.8.1
for p in gcc gcc-c++ zlib pcre pcre-devel openssl openssl-devel
do
if ! rpm -qa | grep -q "^$p";then
yum install -y $p
fi
done
if [ ! -d /etc/nginx -o ! -e /usr/sbin/nginx ];then
useradd -s /sbin/nologin nginx -M
cd /usr/local/src && tar -zxf ${nginx_s} -C . && cd $nginx_v &&
./configure \
--user=nginx \
--group=nginx \
--prefix=/usr/local/nginx \
--sbin-path=/usr/sbin/nginx \
--conf-path=/etc/nginx/nginx.conf \
--pid-path=/var/run/nginx.pid \
--lock-path=/var/lock/subsys/nginx \
--with-http_stub_status_module \
--with-http_ssl_module \
--with-http_gzip_static_module \
--http-log-path=/var/log/nginx/access.log \
--error-log-path=/var/log/nginx/error.log \
--http-client-body-temp-path=/tmp/nginx/client_body \
--http-proxy-temp-path=/tmp/nginx/proxy \
--http-fastcgi-temp-path=/tmp/nginx/fastcgi \
--with-http_degradation_module \
--with-http_realip_module \
--with-http_addition_module \
--with-http_sub_module \
--with-pcre
make && make install
chown -R nginx:nginx /usr/local/nginx && mkdir /tmp/nginx/client_body -p && mkdir /etc/nginx/vhosts
# nginx.conf
cat > /etc/nginx/nginx.conf << EOF
user nginx nginx;
worker_processes $(cat /proc/cpuinfo | grep 'processor' | wc -l);
error_log /var/log/nginx/error.log notice;
pid /var/run/nginx.pid;
worker_rlimit_nofile 65535;
events
{
use epoll;
worker_connections 65535;
}
http
{
include mime.types;
default_type application/octet-stream;
server_names_hash_bucket_size 2048;
server_names_hash_max_size 2048;
log_formatmain'\$HTTP_X_REAL_IP - \$remote_user [\$time_local] "\$request" '
'\$status \$body_bytes_sent "\$http_referer" "\$request_time"'
'"\$http_user_agent" \$HTTP_X_Forwarded_For';
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 60;
client_header_timeout 3m;
client_body_timeout 3m;
client_max_body_size 10m;
client_body_buffer_size 256k;
send_timeout 3m;
connection_pool_size 256;
client_header_buffer_size 32k;
large_client_header_buffers 4 64k;
request_pool_size 4k;
output_buffers 4 32k;
postpone_output 1460;
client_body_temp_path /tmp/nginx/client_body;
proxy_temp_path /tmp/nginx/proxy;
fastcgi_temp_path /tmp/nginx/fastcgi;
gzip on;
gzip_min_length 1k;
gzip_buffers 4 16k;
gzip_comp_level 3;
gzip_http_version 1.1;
gzip_types text/plain application/x-javascript text/css text/htm application/xml;
gzip_vary on;
fastcgi_connect_timeout 300;
fastcgi_send_timeout 300;
fastcgi_read_timeout 300;
fastcgi_buffer_size 64k;
fastcgi_buffers 4 64k;
fastcgi_busy_buffers_size 128k;
fastcgi_temp_file_write_size 128k;
fastcgi_intercept_errors on;
include vhosts/*.conf;
}
EOF
# nginx_vhosts.conf
cat > /etc/nginx/vhosts/www.conf << EOF
server {
listen 80;
server_name $(ifconfig eth0 | awk -F"[ :]+" '/inet addr/{print $4}');
index index.html index.htm index.php index.jsp;
charset UTF8;
root /data/www/html;
access_log/var/log/nginx/access.log main;
}
EOF
mkdir /data/www/html -p && echo $(ifconfig eth0 | awk -F"[ :]+" '/inet addr/{print $4}') > /data/www/html/index.html
/usr/sbin/nginx -t && /usr/sbin/nginx
echo
echo "--------------------------------"
echo "Install ${nginx_v} success"
echo "Test http://$(ifconfig eth0 | awk -F"[ :]+" '/inet addr/{print $4}')"
else
echo "Already installed ${nginx_v}"
fi
四、在两台Director上配置keepalived
1、配置keepalived
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# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
mail@huangming.org
741616710@qq.com
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_HA
}
vrrp_instance LVS_HA {
state BACKUP # 主备服务器均为BACKUP
interface eth0 # 指定keepalived监听网络的接口
virtual_router_id 81 # ID标识，master和backup保持一致
priority 100 # backup为90
advert_int 2 # master和backup之间检查同步的时间间隔
nopreempt # 不抢占模式，仅在master上设置
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.20/24 dev eth0 # VIP，可以设置多个，每行一个
}
}
virtual_server 10.0.0.20 80 { # (LVS配置)
delay_loop 5 # (每隔5秒查询realserver状态)
lb_algo wlc # (lvs算法)
lb_kind DR # (lvs负载均衡模式)
persistence_timeout 0 # (保持会话时间，0表示永久保持)
persistence_granularity 255.255.255.255# (持久连接的粒度，默认为4个255，即一个单独的客户端IP分配到一个Realserver上)
protocol TCP # (转发的协议类型，TCP或UDP)
sorry_server 10.0.0.11 8080 # (备用Realserver节点，当所有的realserver节点失效后，将启用这个节点)
real_server 10.0.0.13 80 { # Realserver
weight 2 # (调度权重)
HTTP_GET { # (健康检测方式)
url { # (指定检测的url，可以指定多个)
path /index.html # (url详细路径)
status_code 200
}
connect_port 80 # (检查的端口)
#bindto 10.0.0.20 # (表示通过此地址来发送请求对服务器进行健康检查)
connect_timeout 3 # (无响应超时时间)
nb_get_retry 3 # (失败重试次数)
delay_before_retry 1 # (重试时间间隔)
}
}
real_server 10.0.0.14 80 {
weight 2 # (调度权重)
HTTP_GET { # (健康检测方式)
url { # (指定检测的url，可以指定多个)
path /index.html # (url详细路径)
status_code 200
}
connect_port 80 # (检查的端口)
#bindto 10.0.0.20 # (表示通过此地址来发送请求对服务器进行健康检查)
connect_timeout 3 # (无响应超时时间)
nb_get_retry 3 # (失败重试次数)
delay_before_retry 1 # (重试时间间隔)
}
}
2、分别启动keepalived服务
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# service keepalived start
# service keepalived start
# ps aux | grep keepalived
root 40080.00.1449281080 ? Ss 19:01 0:00 keepalived -D
root 40090.10.2471522332 ? S 19:01 0:00 keepalived -D
root 40100.10.1470321608 ? S 19:01 0:00 keepalived -D
root 40180.00.0 103256 864 pts/0 S+ 19:03 0:00 grep keepalived
3、查看LVS状态
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# master上
# ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP10.0.0.20:80 wlc persistent 0
-> 10.0.0.13:80 Route 2 0 0
-> 10.0.0.14:80 Route 2 0 0
# backup上
# ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP10.0.0.20:80 wlc persistent 0
-> 10.0.0.13:80 Route 2 0 0
-> 10.0.0.14:80 Route 2 0 0
4、查看VIP（VIP默认分配在priority权值高的Director上）
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# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:5a:9d:e0 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.11/24 brd 10.0.0.255 scope global eth0
inet 10.0.0.20/24 scope global secondary eth0
inet6 fe80::20c:29ff:fe5a:9de0/64 scope link
valid_lft forever preferred_lft forever
五、在两台Realserver上分别在回环接口上配置vip和关闭arp转发
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# 查看系统默认arp规则
# cat /proc/sys/net/ipv4/conf/lo/arp_ignore
0
# cat /proc/sys/net/ipv4/conf/lo/arp_announce
0
# cat /proc/sys/net/ipv4/conf/all/arp_ignore
0
# cat /proc/sys/net/ipv4/conf/all/arp_announce
0
在两台Realserver上执行以下脚本
# lvs_dr_rs.sh
#!/bin/bash
vip=10.0.0.20
ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up
route add -host $vip lo:0
echo "1" > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" > /proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" > /proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" > /proc/sys/net/ipv4/conf/all/arp_announce
# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet 10.0.0.20/32 brd 10.0.0.20 scope global lo:0
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:c5:b4:19 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.13/24 brd 10.0.0.255 scope global eth0
inet6 fe80::20c:29ff:fec5:b419/64 scope link
valid_lft forever preferred_lft forever
# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet 10.0.0.20/32 brd 10.0.0.20 scope global lo:0
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:42:34:4f brd ff:ff:ff:ff:ff:ff
inet 10.0.0.14/24 brd 10.0.0.255 scope global eth0
inet6 fe80::20c:29ff:fe42:344f/64 scope link
valid_lft forever preferred_lft forever
六、测试LVS负载功能
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# 这里分别在node3和node4上访问VIP，在我的keepalived配置里我配置了wlc最小连接调度算法，
和权值为2，所以访问的效果如下
# curl http://10.0.0.20
10.0.0.13
# curl http://10.0.0.20
10.0.0.13
# curl http://10.0.0.20
10.0.0.14
# curl http://10.0.0.20
10.0.0.14
七、测试主Director故障，看是否实现故障转移（vip转至backup上）
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# 关闭主Director的keepalived服务
# service keepalived stop
Stopping keepalived:
# 查看BACKUP的ip
# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:42:43:20 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.12/24 brd 10.0.0.255 scope global eth0
inet 10.0.0.20/24 scope global secondary eth0
inet6 fe80::20c:29ff:fe42:4320/64 scope link
valid_lft forever preferred_lft forever
# 测试是否还能正常通过vip访问web服务
# curl http://10.0.0.20
10.0.0.13
# curl http://10.0.0.20
10.0.0.13
# curl http://10.0.0.20
10.0.0.14
# curl http://10.0.0.20
10.0.0.14
八、在Realserver配置DR模式启动服务脚本
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# cat lvs-dr-rs.service
#!/bin/bash
. /etc/rc.d/init.d/functions
vip=10.0.0.20
RETVAL=$?
case "$1" in
start)
echo "Start realserver"
ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up
route add -host $vip dev lo:0
echo "1" > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" > /proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" > /proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" > /proc/sys/net/ipv4/conf/all/arp_announce
;;
stop)
echo "Stop realserver"
ifconfig lo:0 down
echo "0" > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" > /proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" > /proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" > /proc/sys/net/ipv4/conf/all/arp_announce
;;
*)
echo Usage: $0 {start|stop}
exit 1
esac
exit $RETVAL
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