centos7 配置调优
# 颜色
echo "PS1='\[\033[35m\][\[\033[00m\]\[\033[31m\]\u\[\033[33m\]\[\033[33m\]@\[\033[03m\]\[\033[35m\]\h\[\033[00m\] \[\033[5;32m\]\w\[\033[00m\]\[\033[35m\]]\[\033[00m\]\[\033[5;31m\]\\$\[\033[00m\] '" >> ~/.bashrc && source ~/.bashrc
# 0、centos7 环境配置
# 安装 vim
yum -y install vim wget net-tools
# 行号
echo "set nu" >> /root/.vimrc
# 搜索关键字高亮
sed -i "8calias grep='grep --color'" /root/.bashrc
# 腾讯源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos7_base.repo
wget -O /etc/yum.repos.d/CentOS-Epel.repo http://mirrors.cloud.tencent.com/repo/epel-7.repo
yum clean all
yum makecache
# 1、设置主机名
hostnamectl set-hostname k8s-master
hostnamectl set-hostname k8s-node1
hostnamectl set-hostname k8s-node2
# 2、添加hosts解析
cat >> /etc/hosts << EOF
192.168.1.201 k8s-master
192.168.1.202 k8s-node1
192.168.1.203 k8s-node2
EOF
# 3、同步时间
yum -y install ntp
systemctl enable ntpd --now
# 4、永久关闭seLinux(需重启系统生效)
setenforce 0
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
# 5、永久关闭swap(需重启系统生效)
swapoff -a # 临时关闭
sed -i 's/.*swap.*/#&/g' /etc/fstab # 永久关闭
# 6、升级内核为5.4版本(需重启系统生效)
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-5.el7.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel install -y kernel-lt
grub2-set-default 0
#这里先重启再继续
reboot
# 7、关闭防火墙、清空iptables规则
systemctl disable firewalld && systemctl stop firewalld
iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X && iptables -P FORWARD ACCEPT && service iptables save
# 8、关闭 NetworkManager
systemctl disable NetworkManager && systemctl stop NetworkManager
# 9、加载IPVS模块
yum -y install ipset ipvsadm
cat > /etc/sysconfig/modules/ipvs.modules <<EOF
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack
EOF
modprobe -- nf_conntrack
chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep -e ip_vs -e nf_conntrack
# 10、开启br_netfilter、ipv4 路由转发
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF
sudo modprobe overlay
sudo modprobe br_netfilter
# 设置所需的 sysctl 参数，参数在重新启动后保持不变
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward = 1
EOF
# 应用 sysctl 参数而不重新启动
sudo sysctl --system
# 查看是否生效
lsmod | grep br_netfilter
lsmod | grep overlay
sysctl net.bridge.bridge-nf-call-iptables net.bridge.bridge-nf-call-ip6tables net.ipv4.ip_forward
# 11、内核调优
cat > /etc/sysctl.d/99-sysctl.conf << 'EOF'
# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
# Controls IP packet forwarding
# Controls source route verification
net.ipv4.conf.default.rp_filter = 1
# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0
# Controls the System Request debugging functionality of the kernel
# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1
# Controls the use of TCP syncookies
net.ipv4.tcp_syncookies = 1
# Controls the maximum size of a message, in bytes
kernel.msgmnb = 65536
# Controls the default maxmimum size of a mesage queue
kernel.msgmax = 65536
net.ipv4.conf.all.promote_secondaries = 1
net.ipv4.conf.default.promote_secondaries = 1
net.ipv6.neigh.default.gc_thresh3 = 4096
kernel.sysrq = 1
net.ipv6.conf.all.disable_ipv6=0
net.ipv6.conf.default.disable_ipv6=0
net.ipv6.conf.lo.disable_ipv6=0
kernel.numa_balancing = 0
kernel.shmmax = 68719476736
kernel.printk = 5
net.core.rps_sock_flow_entries=8192
net.bridge.bridge-nf-call-ip6tables=1
net.ipv4.ip_local_reserved_ports=60001,60002
net.core.rmem_max=16777216
fs.inotify.max_user_watches=524288
kernel.core_pattern=core
net.core.dev_weight_tx_bias=1
net.ipv4.tcp_max_orphans=32768
kernel.pid_max=4194304
kernel.softlockup_panic=1
fs.file-max=3355443
net.core.bpf_jit_harden=1
net.ipv4.tcp_max_tw_buckets=32768
fs.inotify.max_user_instances=8192
net.core.bpf_jit_kallsyms=1
vm.max_map_count=262144
kernel.threads-max=262144
net.core.bpf_jit_enable=1
net.ipv4.tcp_keepalive_time=600
net.ipv4.tcp_wmem=4096 12582912 16777216
net.core.wmem_max=16777216
net.ipv4.neigh.default.gc_thresh1=2048
net.core.somaxconn=32768
net.ipv4.neigh.default.gc_thresh3=8192
net.ipv4.ip_forward=1
net.ipv4.neigh.default.gc_thresh2=4096
net.ipv4.tcp_max_syn_backlog=8096
net.bridge.bridge-nf-call-iptables=1
net.ipv4.tcp_rmem=4096 12582912 16777216
EOF
# 应用 sysctl 参数而不重新启动
sudo sysctl --system