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CentOS 8.2 对k8s基础环境配置( 三 )

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两种方式
1 单独指定配置文件加载
sysctl -p /etc/sysctl.d/user.conf2 手动加载所有的配置文件
[root@localhost etc]# sysctl --system* Applying /usr/lib/sysctl.d/10-default-yama-scope.conf ...kernel.yama.ptrace_scope = 0* Applying /usr/lib/sysctl.d/50-coredump.conf ...kernel.core_pattern = |/usr/lib/systemd/systemd-coredump %P %u %g %s %t %c %h %e* Applying /usr/lib/sysctl.d/50-default.conf ...kernel.sysrq = 16kernel.core_uses_pid = 1kernel.kptr_restrict = 1net.ipv4.conf.all.rp_filter = 1net.ipv4.conf.all.accept_source_route = 0net.ipv4.conf.all.promote_secondaries = 1net.core.default_qdisc = fq_codelfs.protected_hardlinks = 1fs.protected_symlinks = 1* Applying /usr/lib/sysctl.d/50-libkcapi-optmem_max.conf ...net.core.optmem_max = 81920* Applying /usr/lib/sysctl.d/50-pid-max.conf ...kernel.pid_max = 4194304* Applying /usr/lib/sysctl.d/60-libvirtd.conf ...fs.aio-max-nr = 1048576* Applying /etc/sysctl.d/99-sysctl.conf ...* Applying /etc/sysctl.d/user.conf ...net.ipv4.ip_forward = 1vm.overcommit_memory = 1vm.panic_on_oom = 0fs.inotify.max_user_watches = 89100fs.file-max = 52706963fs.nr_open = 52706963net.netfilter.nf_conntrack_max = 2310720net.ipv4.tcp_keepalive_time = 600net.ipv4.tcp_keepalive_probes = 3net.ipv4.tcp_keepalive_intvl = 15net.ipv4.tcp_max_tw_buckets = 36000net.ipv4.tcp_tw_reuse = 1net.ipv4.tcp_max_orphans = 327680net.ipv4.tcp_orphan_retries = 3net.ipv4.tcp_syncookies = 1net.ipv4.tcp_max_syn_backlog = 16384net.ipv4.tcp_timestamps = 0net.core.somaxconn = 16384* Applying /etc/sysctl.conf ...完成后就可以重启服务器
reboot重启完成，在查看 ipvs 的配置效果
lsmod | grep --color=auto -e ip_vs -e nf_conntrack二、报错1 域名解析不了ping: baidu.com: Name or service not known
0curl: (6) Could not resolve host: mirrors.aliyun.com
解决
[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-ens160...GATEWAY="192.168.192.2" # 修改网关地址IPV6_PRIVACY="no"# 域名解析，网关也要对DNS1=114.114.114.114DNS2=8.8.8.8重启
[root@localhost software]# nmcli c reload ens160[root@localhost software]# nmcli c up ens160[root@localhost yum.repos.d]# ping baidu.comPING baidu.com (110.242.68.66) 56(84) bytes of data.64 bytes from 110.242.68.66 (110.242.68.66): icmp_seq=1 ttl=128 time=24.0 ms64 bytes from 110.242.68.66 (110.242.68.66): icmp_seq=2 ttl=128 time=26.5 ms^C--- baidu.com ping statistics ---2 packets transmitted, 2 received, 0% packet loss, time 4msrtt min/avg/max/mdev = 24.005/25.233/26.462/1.238 ms2 yum 安装出错[root@localhost yum.repos.d]# yum -y install epel-releaseCentOS-8 - AppStream81B/s |38B00:00Error: Failed to download metadata for repo 'AppStream': Cannot prepare internal mirrorlist: No URLs in mirrorlist解决
如果仍然需要运行旧CentOS 8，可以在/etc/yum.repos中更新repos.d使用vault.centos.org代替mirror.centos.org
修改下面两个文件
cd /etc/yum.repos.dvi CentOS-Base.repovi CentOS-AppStream.repoCentOS-BaseOS.repo的内容修改为
[baseos]name=CentOS Linux $releasever - BaseOS#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=BaseOS&infra=$infra#baseurl=http://mirror.centos.org/$contentdir/$releasever/BaseOS/$basearch/os/baseurl=https://vault.centos.org/centos/$releasever/BaseOS/$basearch/os/gpgcheck=1enabled=1gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficialCentOS-AppStream.repo的内容修改为
[appstream]name=CentOS Linux $releasever - AppStream#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=AppStream&infra=$infra#baseurl=http://mirror.centos.org/$contentdir/$releasever/AppStream/$basearch/os/baseurl=https://vault.centos.org/centos/$releasever/AppStream/$basearch/os/gpgcheck=1enabled=1gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial再执行yum -y install epel-release命令，发现成功了?。?
三、安装 k8sCentOS 8.2 安装 kubernetes-1.25.1：https://www.cnblogs.com/huaxiayuyi/p/16794583.html

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