新建swap分区的规划、挂载和自动挂载示例
注:來自Linux系統管理_磁盤分區和格式化的擴展
Linux系統管理_磁盤分區和格式化:http://murongqingqqq.blog.51cto.com/2902694/1361918
?
思路:
第一步:首先查看當前swap分區的大小:free -m
第二步:新建磁盤分區指定狀態為82,即為swap分區格式:fdisk命令
第三步:重讀磁盤分區:partprobe命令
第四步:格式化swap分區:mkswap命令
第五步:手動掛載和卸載swap分區:swapon/off
第六步:設置開機自動掛載swap分區:swapon -a
?
具體操作:
第一步:首先查看當前swap分區的大小:free -m
[root@localhost ~]# free -mtotal used free shared buffers cachedMem: 495 285 209 0 18 167-/+ buffers/cache: 99 395Swap: 2047 0 2047[root@localhost ~]# fdisk -l /dev/sdaDisk /dev/sda: 64.4 GB, 64424509440 bytes255 heads, 63 sectors/track, 7832 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDevice Boot Start End Blocks Id System/dev/sda1 * 1 25 200781 83 Linux/dev/sda2 26 2575 20482875 83 Linux/dev/sda3 2576 3850 10241437+ 83 Linux/dev/sda4 3851 7832 31985415 5 Extended/dev/sda5 3851 4111 2096451 82 Linux swap / Solaris?
?
第二步:新建磁盤分區指定狀態為82,即為swap分區格式:fdisk命令
?
[root@localhost ~]# fdisk /dev/sdaThe number of cylinders for this disk is set to 7832.There is nothing wrong with that, but this is larger than 1024,and could in certain setups cause problems with:1) software that runs at boot time (e.g., old versions of LILO)2) booting and partitioning software from other OSs(e.g., DOS FDISK, OS/2 FDISK)Command (m for help): nFirst cylinder (4112-7832, default 4112):Using default value 4112Last cylinder or +size or +sizeM or +sizeK (4112-7832, default 7832): +1GCommand (m for help): pDisk /dev/sda: 64.4 GB, 64424509440 bytes255 heads, 63 sectors/track, 7832 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDevice Boot Start End Blocks Id System/dev/sda1 * 1 25 200781 83 Linux/dev/sda2 26 2575 20482875 83 Linux/dev/sda3 2576 3850 10241437+ 83 Linux/dev/sda4 3851 7832 31985415 5 Extended/dev/sda5 3851 4111 2096451 82 Linux swap / Solaris/dev/sda6 4112 4234 987966 83 LinuxCommand (m for help): tPartition number (1-6): 6Hex code (type L to list codes): 82Changed system type of partition 6 to 82 (Linux swap / Solaris)Command (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.WARNING: Re-reading the partition table failed with error 16: 設備或資源忙.The kernel still uses the old table.The new table will be used at the next reboot.Syncing disks.[root@localhost ~]# ls /dev/sd*/dev/sda /dev/sda1 /dev/sda2 /dev/sda3 /dev/sda4 /dev/sda5?
?
第三步:重讀磁盤分區:partprobe命令
[root@localhost ~]# partprobe[root@localhost ~]# ls /dev/sd*/dev/sda /dev/sda1 /dev/sda2 /dev/sda3 /dev/sda4 /dev/sda5 /dev/sda6?
?
?
第四步:格式化swap分區:mkswap命令
[root@localhost ~]# mkswap /dev/sda6Setting up swapspace version 1, size = 1011671 kB?
?
第五步:手動掛載和卸載swap分區:swapon/off
[root@localhost ~]# free -mtotal used free shared buffers cachedMem: 495 287 208 0 18 168-/+ buffers/cache: 99 395Swap: 2047 0 2047[root@localhost ~]# swapon /dev/sda6[root@localhost ~]# free -mtotal used free shared buffers cachedMem: 495 287 207 0 18 168-/+ buffers/cache: 100 395Swap: 3012 0 3012[root@localhost ~]# swapon -s //查看都有哪些交換分區掛載 Filename Type Size Used Priority/dev/sda5 partition 2096440 0 -1/dev/sda6 partition 987956 0 -3[root@localhost ~]# swapoff /dev/sda6 //卸載swap分區 [root@localhost ~]# swapon -sFilename Type Size Used Priority/dev/sda5 partition 2096440 0 -1?
?
第六步:設置開機自動掛載swap分區
[root@localhost ~]# cat /etc/fstabLABEL=/ / ext3 defaults 1 1LABEL=/data /data ext3 defaults 1 2LABEL=/boot /boot ext3 defaults 1 2tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0LABEL=SWAP-sda5 swap swap defaults 0 0[root@localhost ~]# vim /etc/fstab //編輯/etc/fstab文件,增加下面內容 [root@localhost ~]# cat /etc/fstab | grep sda6 //將下面的信息添加到/etc/fstab文件/dev/sda6 swap swap defaults 0 0[root@localhost ~]# swapon -sFilename Type Size Used Priority/dev/sda5 partition 2096440 0 -1[root@localhost ~]# swapon -a //用swapon -a來重讀/etc/fstab文件,使新swap分區掛載 [root@localhost ~]# swapon -s //再次用swapon -s查看的時候,新的swap分區sda6成功掛載 Filename Type Size Used Priority/dev/sda5 partition 2096440 0 -1/dev/sda6 partition 1959888 0 -5[root@localhost ~]#?
?
?
?
?
擴展:swap分區開機自動掛載的第二種方式:
第一步:修改/etc/rc.d/rc.local文件
第二步:將swapon /dev/sda6寫入這個腳本當中,那么開機就可以自動掛載交換分區/dev/sda6了!!!
?
?
?
注:用swapon -a和reboot命令來實現重讀/etc/fstab文件,實現開機自動掛載。
普通分區重讀/etc/fstab文件的時候用mount -a,swap分區重讀/etc/fstab文件的時候,
使用swapon -a ?
?
轉載于:https://www.cnblogs.com/felixzh/p/9238279.html
總結
以上是生活随笔為你收集整理的新建swap分区的规划、挂载和自动挂载示例的全部內容,希望文章能夠幫你解決所遇到的問題。
- 上一篇: SpringCloud2.0入门3-新的
- 下一篇: Spring Boot OAuth 2.