前提-配置java環(huán)境變量

準(zhǔn)備centos服務(wù)器或者虛擬機(jī)，以及JAVA環(huán)境，這個(gè)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(dòng)./apache-tomcat-8.5.31/bin/startup.sh

nginx

下載及解壓 相關(guān)的模塊到/u01目錄

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

配置并啟動(dòng)，最精簡的nginx負(fù)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(nèi)容

接下來就是通過keepalived實(shí)現(xiàn)nginx的高可用了

學(xué)習(xí)感言

這是我在學(xué)習(xí)下面這些高并發(fā)分布式技術(shù)時(shí)的筆記，不知道怎么發(fā)附件，需要配置文件的話我后續(xù)補(bǔ)上，或者你可以私信我。

高并發(fā)分布式技術(shù)學(xué)習(xí)課程

keepalived

下載安裝相關(guān)相關(guān)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.gz

• tar -xvf keepalived-1.4.4.tar.gz
• cd 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(gè)nginx_monitor監(jiān)控腳本，主備各一份keepalived配置）

nginx監(jiān)控shell腳本 nginx_monitor.sh 文件

\創(chuàng)建nginx monitor 腳本，
并賦予可執(zhí)行權(quán)限chmod +x /etc/keepalived/nginx_monitor.sh

• 測試一下腳本能不能執(zhí)行執(zhí)行命令：
  /etc/keepalived/nginx_monitor.sh 沒報(bào)錯(cuò)即表示為成功

nginx_monitor.sh

keepalived配置（/etc/keepalived/目錄下）

• master主機(jī)keepalived-nginx-master.conf
  放在備機(jī)- backup備機(jī)keepalived-nginx-backup.conf

keepalived-nginx-master.conf

keepalived-nginx-backup.conf

啟動(dòng)keepalived

• 啟動(dòng)master主機(jī)
  /usr/local/keepalived/sbin/keepalived -f /etc/keepalived/keepalived-nginx-master.conf
• 啟動(dòng)backup備機(jī)/usr/local/keepalived/sbin/keepalived -f /etc/keepalived/keepalived-nginx-backup.conf

停止

ps -ef | grep keepalivedkill -9 關(guān)閉相關(guān)的進(jìn)程

測試高可用

1. 關(guān)掉備機(jī)，功能完全不受影響。2. 關(guān)掉主機(jī)，虛擬IP漂移到備機(jī)，備機(jī)開始工作。3. 關(guān)掉主機(jī)nginx，主機(jī)監(jiān)控到無nginx后，自動(dòng)切換