中间件服务器内核参数优化

echo "1" > /proc/sys/vm/overcommit_memory
echo never > /sys/kernel/mm/transparent_hugepage/enabled
echo never > /sys/kernel/mm/transparent_hugepage/defrag
centos_kernel=`uname -r | awk -F "." ‘{print $1$2}‘`
if [ $centos_kernel == 26 ];then
    echo "kernel_veriosn:" $centos_kernel
    sysctl -w vm.swappiness=0
    cat /etc/sysctl.conf | grep ‘vm.swappiness=‘
    if [ $? == "0" ];then
        sed -i ‘s/^vm.swappiness.*//g‘ /etc/sysctl.conf
        echo ‘vm.swappiness=0‘ >> /etc/sysctl.conf
        sed -i ‘/^$/d‘ /etc/sysctl.conf
    else
        echo ‘vm.swappiness=0‘ >> /etc/sysctl.conf
    fi
elif [ $centos_kernel == 310 ];then
    echo "kernel_veriosn:" $centos_kernel
    sysctl -w vm.swappiness=1
    cat /etc/sysctl.conf | grep vm.swappiness=
    if [ $? == "0" ];then
        sed -i ‘s/^vm.swappiness.*//g‘ /etc/sysctl.conf
        echo ‘vm.swappiness=1‘ >> /etc/sysctl.conf
        sed -i ‘/^$/d‘ /etc/sysctl.conf
    else
        echo ‘vm.swappiness=1‘ >> /etc/sysctl.conf
    fi
else
    echo "kernel_veriosn:" $centos_kernel
    exit 1
fi
over_memory=`cat /proc/sys/vm/overcommit_memory`
echo "overcommit_memory:" $over_memory
defrag=`cat /sys/kernel/mm/transparent_hugepage/defrag`
echo "defrag:" $defrag
cat /etc/sysctl.conf | grep ‘vm.swappiness=‘

cat /etc/sysctl.conf | grep "vm.max_map_count" 
if [ $? -ne 0 ];then
    sudo sed -i ‘s/^vm.max_map_count.*//g‘ /etc/sysctl.conf
    sudo echo "vm.max_map_count=262144" >> /etc/sysctl.conf
    sudo sed -i ‘/^$/d‘ /etc/sysctl.conf
fi

cat /etc/sysctl.conf | grep "vm.swappiness" 
if [ $? -ne 0 ];then
    sudo sed -i ‘s/^vm.swappiness.*//g‘ /etc/sysctl.conf
    suso echo ‘vm.swappiness=0‘ >> /etc/sysctl.conf
    sudo sed -i ‘/^$/d‘ /etc/sysctl.conf
fi
sudo echo "*    soft    nproc    524288" >> /etc/security/limits.d/90-nproc.conf
sudo swapoff -a
sudo sh -c "echo ‘swapoff -a‘ >>/etc/rc.local"
sudo sysctl -p