前提-配置java環境變量

準備centos服務器或者虛擬機，以及JAVA環境，這個是必須的前提啊，我相信你可以的。

tomcat

# 下載curl "http://mirror.bit.edu.cn/apache/tomcat/tomcat-8/v8.5.31/bin/apache-tomcat-8.5.31.tar.gz" -o apache-tomcat-8.5.31.tar.gz# 解壓tar -xvf apache-tomcat-8.5.31.tar.gz # 啟動./apache-tomcat-8.5.31/bin/startup.sh

nginx

下載及解壓相關的模塊到/u01目錄

curl "http://nginx.org/download/nginx-1.14.0.tar.gz" -o nginx-1.14.0.tar.gztar -xvf nginx-1.14.0.tar.gzcurl "http://www.zlib.net/zlib-1.2.11.tar.gz" -o zlib-1.2.11.tar.gztar -xvf zlib-1.2.11.tar.gzcurl "https://jaist.dl.sourceforge.net/project/pcre/pcre/8.41/pcre-8.41.tar.gz" -o pcre-8.41.tar.gztar -xvf pcre-8.41.tar.gzcurl "https://www.openssl.org/source/openssl-1.0.2o.tar.gz" -o openssl-1.0.2o.tar.gztar -xvf openssl-1.0.2o.tar.gz

編譯安裝nginx

cd nginx-1.14.0./configure --prefix=/usr/local/nginx --with-http_ssl_module --with-pcre=../pcre-8.41 --with-zlib=../zlib-1.2.11 --with-openssl=../openssl-1.0.2omake make install

如果有異常：./configure: error: C compiler cc is not found，則安裝gcc等軟件

yum -y install gcc gcc-c++ autoconf automake make

配置並啟動，最精簡的nginx負載均衡配置，僅15行配置，直接覆蓋conf文件夾下面的nginx.conf

nginx.conf全部內容

接下來就是通過keepalived實現nginx的高可用了

學習感言

這是我在學習下面這些高併發分佈式技術時的筆記，不知道怎麼發附件，需要配置文件的話我後續補上，或者你可以私信我。

高併發分佈式技術學習課程

keepalived

下載安裝相關相關的組件

yum -y install openssl-devel yum -y install libnl libnl-develyum install -y libnfnetlink-devel

下載安裝keepalived

# 下載curl "http://www.keepalived.org/software/keepalived-1.4.4.tar.gz" -o keepalived-1.4.4.tar.gztar -xvf keepalived-1.4.4.tar.gzcd keepalived-1.4.4 # 安裝到/usr/local/keepalived目錄./configure --prefix=/usr/local/keepalived --sysconf=/etc make && make install

配置文件存放地址

配置放在/etc/keepalived/，三份配置文件（一個nginx_monitor監控腳本，主備各一份keepalived配置）

nginx監控shell腳本 nginx_monitor.sh 文件

# 創建nginx monitor 腳本，並賦予可執行權限chmod +x /etc/keepalived/nginx_monitor.sh# 測試一下腳本能不能執行執行命令：/etc/keepalived/nginx_monitor.sh 沒報錯即表示為成功

nginx_monitor.sh

keepalived配置（/etc/keepalived/目錄下）

# - master主機keepalived-nginx-master.conf# 放在備機- backup備機keepalived-nginx-backup.conf

keepalived-nginx-master.conf

keepalived-nginx-backup.conf

啟動keepalived

# 啟動master主機/usr/local/keepalived/sbin/keepalived -f /etc/keepalived/keepalived-nginx-master.conf# 啟動backup備機/usr/local/keepalived/sbin/keepalived -f /etc/keepalived/keepalived-nginx-backup.conf

停止

ps -ef | grep keepalivedkill -9 關閉相關的進程

測試高可用

1. 關掉備機，功能完全不受影響。2. 關掉主機，虛擬IP漂移到備機，備機開始工作。3. 關掉主機nginx，主機監控到無nginx後，自動切換