#!/bin/sh
#install redis
. /etc/init.d/functions 

#安裝依賴包
yum -y -q install gcc jemalloc-devel make wget || { action "安裝依賴包失敗,請檢查環境" false ;exit; }

#下載原始碼包並解壓
wget http://download.redis.io/releases/redis-5.0.9.tar.gz || { action "原始碼包下載失敗" false ;exit; }
tar xvf redis-5.0.9.tar.gz

#建立安裝目錄及使用者
mkdir /apps
id redis >& /dev/null
 
 || { useradd -r -s /sbin/nologin redis; action "redis使用者建立成功"; }

#編譯安裝
cd redis-5.0.9/
make PREFIX=/apps/redis install >& /dev/null && action "redis編譯安裝完成" 

#配置環境變數
echo 'PATH=/apps/redis/bin:$PATH' > /etc/profile.d/redis.sh
source /etc/profile.d/redis.sh
ln -sv /apps/redis/bin/redis-* /usr/bin/

#準備相關目錄和配置檔案
 
mkdir -pv /apps/redis/{etc,log,data,run}
cp /root/redis-5.0.9/redis.conf /apps/redis/etc/

#三個告警處理
cat > /etc/sysctl.conf <<EOF
vm.overcommit_memory = 1
net.core.somaxconn = 1024
EOF
sysctl -p
echo 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' >> /etc/rc.d/rc.local
chmod +x /etc/rc.d/rc.local
source 
 
/etc/rc.d/rc.local

#服務啟動檔案
cat >  /usr/lib/systemd/system/redis.service <<EOF
[Unit]
Description=Redis persistent key-value database
After=network.target

[Service]
ExecStart=/apps/redis/bin/redis-server /apps/redis/etc/redis.conf --supervised systemd
ExecStop=/bin/kill -s QUIT \$MAINPID
Type=notify
User=redis
Group=redis
RuntimeDirectory=redis
RuntimeDirectoryMode=0755

[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable --now redis &> /dev/null && action "redis服務啟動成功" || { action "redis啟動失敗" false ;exit; }