查看服务监听的IP中是否有IPv6格式的地址
netstat -tuln
如果有tcp6协议的就是有打开ip6
编辑/etc/default/grub，在GRUB_CMDLINE_LINUX加上的后面句首加上ipv6.disable=1。
修改前:
[[email protected] Desktop]# cat /etc/default/grub GRUB_TIMEOUT=5 GRUB_DISTRIBUTOR="$(sed ‘s, release .*$,,g‘ /etc/system-release)" GRUB_DEFAULT=saved GRUB_DISABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT="console" GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet" GRUB_DISABLE_RECOVERY="true"
修改后：
[[email protected] Desktop]# cat /etc/default/grub GRUB_TIMEOUT=5 GRUB_DISTRIBUTOR="$(sed ‘s, release .*$,,g‘ /etc/system-release)" GRUB_DEFAULT=saved GRUB_DISABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT="console" GRUB_CMDLINE_LINUX="ipv6.disable=1 rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet" GRUB_DISABLE_RECOVERY="true"
修改完毕后保存，运行grub2-mkconfig -o /boot/grub2/grub.cfg重新生成grub.cfg文件。[[email protected] Desktop]# grub2-mkconfig -o /boot/grub2/grub.cfg Generating grub configuration file ... Found linux image: /boot/vmlinuz-3.10.0-514.2.2.el7.x86_64 Found initrd image: /boot/initramfs-3.10.0-514.2.2.el7.x86_64.img Found linux image: /boot/vmlinuz-3.10.0-327.36.3.el7.x86_64 Found initrd image: /boot/initramfs-3.10.0-327.36.3.el7.x86_64.img Found linux image: /boot/vmlinuz-3.10.0-327.el7.x86_64 Found initrd image: /boot/initramfs-3.10.0-327.el7.x86_64.img Found linux image: /boot/vmlinuz-0-rescue-d885883cdb4944609bc5e3493dd2b680 Found initrd image: /boot/initramfs-0-rescue-d885883cdb4944609bc5e3493dd2b680.img done
重启系统，查看ip6是否关闭。