1>搭建redis 主從+哨兵
2>搭建nginx 主從+keepalived 高可用
3>源碼：https://github.com/hd19940104/java
4>各個配置
一：redis：先配置主從：之後在每一個節點配置哨兵：
# 這個是Redis6379配置內容，其他文件同理新增然後改一下端口即可，26380，和 26381。
#當前Sentinel服務運行的端口
port 26379
# 哨兵監聽的主服務器
#sentinel myid 551269539259ffd5a9fa767401b7c6a37c9b5ccd
# 3s內mymaster無響應，則認爲mymaster宕機了
sentinel myid b8ec6b8a30e649678fd7346ed2e85108adbd5232
#如果10秒後,mysater仍沒啓動過來，則啓動failover
sentinel monitor mymaster 192.168.1.114 6379 1
# 執行故障轉移時， 最多有1個從服務器同時對新的主服務器進行同步
sentinel down-after-milliseconds mymaster 3000
# Generated by CONFIG REWRITE
dir "/myredis"
#sentinel config-epoch mymaster 0
#sentinel leader-epoch mymaster 0
#sentinel current-epoch 0
protected-mode no
sentinel auth-pass mymaster admin
sentinel config-epoch mymaster 0
sentinel leader-epoch mymaster 1
sentinel known-slave mymaster 192.168.1.103 6379
sentinel known-slave mymaster 192.168.1.113 6379
sentinel current-epoch 1
二：
安裝nginx：解壓
#user nobody;
worker_processes 1;
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
pid logs/nginx.pid;
events {
worker_connections 1024;
}
http {
limit_req_zone $binary_remote_addr zone=one:10m rate=30r/m;
include mime.types;
default_type application/octet-stream;
#log_format main '$remote_addr - $remote_user [$time_local] "$request" '
# '$status $body_bytes_sent "$http_referer" '
# '"$http_user_agent" "$http_x_forwarded_for"';
#access_log logs/access.log main;
sendfile on;
tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 65;
#gzip on;
# another virtual host using mix of IP-, name-, and port-based configuration
upstream backserver {
server 192.168.1.114:8080 weight=1;
server 192.168.1.114:8081 weight=1;
server 192.168.1.114:8082 weight=1;
}
server {
listen 80;
server_name www.test.com;
location / {
proxy_pass http://backserver;
index login.html;
}
}
#server {
# listen 8000;
# listen somename:8080;
# server_name somename alias another.alias;
# location / {
# root html;
# index index.html index.htm;
# }
#}
# HTTPS server
#
#server {
# listen 443 ssl;
# server_name localhost;
# ssl_certificate cert.pem;
# ssl_certificate_key cert.key;
# ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 5m;
# ssl_ciphers HIGH:!aNULL:!MD5;
# ssl_prefer_server_ciphers on;
# location / {
# root html;
# index index.html index.htm;
# }
#}
}
三：安裝keepalived（每個nginx服務器安裝）
tar -zxvf keepalived-1.2.18.tar.gz -C /usr/local/
yum install -y openssl openssl-devel（需要安裝一個軟件包）
cd keepalived-1.2.18/ && ./configure --prefix=/usr/local/keepalived
make && make install
將keepalived安裝成Linux系統服務，因爲沒有使用keepalived的默認安裝路徑（默認路徑：/usr/local）,安裝完成之後，需要做一些修改工作：
首先創建文件夾，將keepalived配置文件進行復制：
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
然後複製keepalived腳本文件：
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
ln -s /usr/local/sbin/keepalived /usr/sbin/
ln -s /usr/local/keepalived/sbin/keepalived /sbin/
可以設置開機啓動：chkconfig keepalived on
service keepalived start
service keepalived stop
#!/bin/bash
A=`ps -C nginx ¨Cno-header |wc -l`
if [ $A -eq 0 ];then
/usr/local/nginx/sbin/nginx
sleep 2
if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
killall keepalived
fi
fi
---------------
! Configuration File for keepalived
global_defs {
router_id hadoop106 ##標識節點的字符串，通常爲hostname
}
vrrp_script chk_nginx {
script "/etc/keepalived/nginx_check.sh" #運行腳本，腳本內容下面有，就是起到一個nginx宕機以後，自動開啓服務
interval 2 #檢測時間間隔
weight -20 #如果條件成立的話，則權重 -20
}
# 定義虛擬路由，VI_1 爲虛擬路由的標示符，自己定義名稱
vrrp_instance VI_1 {
state MASTER #來決定主從
interface eth0 # 綁定虛擬 IP 的網絡接口，根據自己的機器填寫
virtual_router_id 119 # 虛擬路由的 ID 號， 兩個節點設置必須一樣
mcast_src_ip 192.168.1.106 #填寫本機ip
priority 100 # 節點優先級,主要比從節點優先級高
nopreempt # 優先級高的設置 nopreempt 解決異常恢復後再次搶佔的問題
advert_int 1 # 組播信息發送間隔，兩個節點設置必須一樣，默認 1s
authentication {
auth_type PASS
auth_pass 1111
}
# 將 track_script 塊加入 instance 配置塊
track_script {
chk_nginx #執行 Nginx 監控的服務
}
virtual_ipaddress {
192.168.1.200 # 虛擬ip,也就是解決寫死程序的ip怎麼能切換的ip,也可擴展，用途廣泛。可配置多個。
}
}
