RHEL/centos 8 build kernel

        # https://access.redhat.com/articles/3938081
        
        # grubby --info=ALL | grep title
        
        # https://blog.packagecloud.io/eng/2015/04/20/working-with-source-rpms/
        
        export PROXY="192.168.253.1:5085"
        export PROXY="192.168.203.1:5085"
        
        # 由于需要rhel8.3，而当前8.3还是beta状态，我们需要注册特殊的订阅。
        
        subscription-manager --proxy=$PROXY register --username **** --password ********
        
        # subscription-manager config --rhsm.baseurl=https://china.cdn.redhat.com
        
        # subscription-manager config --rhsm.baseurl=https://cdn.redhat.com
        
        subscription-manager --proxy=$PROXY refresh
        
        subscription-manager --proxy=$PROXY repos --help
        
        subscription-manager --proxy=$PROXY repos --list > list
        
        cat list | grep 'Repo ID' | grep -v source | grep -v debug
        
        subscription-manager --proxy=$PROXY repos --disable="*"
        
        subscription-manager --proxy=$PROXY repos \
            --enable="rhel-8-for-x86_64-baseos-beta-rpms" \
            --enable="rhel-8-for-x86_64-appstream-beta-rpms" \
            --enable="rhel-8-for-x86_64-supplementary-beta-rpms" \
            --enable="rhel-8-for-x86_64-rt-beta-rpms" \
            --enable="rhel-8-for-x86_64-highavailability-beta-rpms" \
            --enable="rhel-8-for-x86_64-nfv-beta-rpms" \
            --enable="fast-datapath-beta-for-rhel-8-x86_64-rpms" \
            --enable="codeready-builder-beta-for-rhel-8-x86_64-rpms" \
            # --enable="dirsrv-beta-for-rhel-8-x86_64-rpms" \
            # ansible-2.9-for-rhel-8-x86_64-rpms
        
        cat << EOF >> /etc/dnf/dnf.conf
        proxy=http://$PROXY
        EOF
        
        # 编译内核，需要rhel7, rhel8里面的epel的包
        
        yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
        dnf -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
        
        yum -y install yum-utils rpm-build
        
        yum list kernel.x86_64
        
        # 下载内核源码包
        
        yumdownloader --source kernel.x86_64
        
        # 安装源码包
        
        rpm -ivh /root/kernel-4.18.0-221.el8.src.rpm
        
        cd /root/rpmbuild/SPECS
        
        # https://stackoverflow.com/questions/13227162/automatically-install-build-dependencies-prior-to-building-an-rpm-package
        
        # 安装辅助包
        
        yum-builddep kernel.spec
        
        # 生成配置
        
        rpmbuild -bp --target=x86_64 kernel.spec
        
        # libbabeltrace-devel
        
        # https://www.cnblogs.com/luohaixian/p/9313863.html
        
        KERNELVERION=`uname -r | sed "s/.$(uname -m)//"`
        KERNELRV=$(uname -r)
        /bin/cp -f /root/rpmbuild/BUILD/kernel-${KERNELVERION}/linux-${KERNELRV}/configs/* /root/rpmbuild/SOURCES/
        
        cd /root/rpmbuild/BUILD/kernel-${KERNELVERION}/linux-${KERNELRV}/
        
        /bin/cp -f configs/kernel-4.18.0-`uname -m`.config .config
        
        # cp /boot/config-`uname -r`   .config
        
        make oldconfig
        
        # 自定义配置，请观看视频
        
        make menuconfig
        
        # vi .config
        
        # CONFIG_MLX5_TC_CT=y
        
        # CONFIG_NET_ACT_CT=m
        
        # CONFIG_SKB_EXTENSIONS=y
        
        # CONFIG_NET_TC_SKB_EXT=y
        
        # CONFIG_NF_FLOW_TABLE=m
        
        # CONFIG_NF_FLOW_TABLE_IPV4=m  x
        
        # CONFIG_NF_FLOW_TABLE_IPV6=m  x
        
        # CONFIG_NF_FLOW_TABLE_INET=m
        
        # CONFIG_NET_ACT_CONNMARK=m x
        
        # CONFIG_NET_ACT_IPT=m  x
        
        # CONFIG_NET_EMATCH_IPT=m   x
        
        # CONFIG_NET_ACT_IFE=m  x
        
        # 指明编译x86
        
        # x86_64
        
        sed -i '1s/^/# x86_64\n/' .config
        
        /bin/cp -f .config configs/kernel-4.18.0-`uname -m`.config
        /bin/cp -f .config configs/kernel-x86_64.config
        
        /bin/cp -f configs/* /root/rpmbuild/SOURCES/
        
        cd /root/rpmbuild/SPECS
        
        # cp kernel.spec kernel.spec.orig
        
        # https://fedoraproject.org/wiki/Building_a_custom_kernel
        
        # 自定义内核名称
        
        sed -i "s/# define buildid \\.local/%define buildid \\.wzh/" kernel.spec
        
        # rpmbuild -bb --target=`uname -m` --without kabichk  kernel.spec 2> build-err.log | tee build-out.log
        
        # rpmbuild -bb --target=`uname -m` --without debug --without debuginfo --without kabichk kernel.spec 2> build-err.log | tee build-out.log
        
        rpmbuild -bb --target=`uname -m` --with baseonly --without debug --without debuginfo --without kabichk kernel.spec 2> build-err.log | tee build-out.log
        
        cd /root/rpmbuild/RPMS/x86_64/
        
        # 安装编译的内核
        
        INSTALLKV=4.18.0-221.el8.wzh
        
        yum install ./kernel-$INSTALLKV.x86_64.rpm ./kernel-core-$INSTALLKV.x86_64.rpm ./kernel-modules-$INSTALLKV.x86_64.rpm
        
        # 重启以后，检查内核模块激活
        
        grep -R --include=Makefile CONFIG_NET_ACT_IFE
        
        # rpmbuild/BUILD/kernel-4.18.0-221.el8/linux-4.18.0-221.el8.wzh.x86_64/net/sched/Makefile:obj-$(CONFIG_NET_ACT_IFE) += act_ife.o
        
        modprobe act_ife
        lsmod | grep act_ife