linux下boot空间不足解决方法

在安装linux的过程中都喜欢把boot挂单独挂分区,一般设置500M,

可随着linux升级,往往会攒下好几个内核,某一天系统会提示你升级失败,空间不足了。。。

既然已经知道是boot空间不足了,那首先我们看看里面都有神马东西!!

[email protected]:~$ ls /boot

abi-2.6.35-25-generic memtest86+.bin

abi-2.6.35-27-generic memtest86+_multiboot.bin

abi-2.6.35-28-generic System.map-2.6.35-25-generic

config-2.6.35-25-generic System.map-2.6.35-27-generic

config-2.6.35-27-generic System.map-2.6.35-28-generic

config-2.6.35-28-generic vmcoreinfo-2.6.35-25-generic

grub vmcoreinfo-2.6.35-27-generic

initrd.img-2.6.35-25-generic vmcoreinfo-2.6.35-28-generic

initrd.img-2.6.35-27-generic vmlinuz-2.6.35-25-generic

initrd.img-2.6.35-28-generic vmlinuz-2.6.35-27-generic

lost+found vmlinuz-2.6.35-28-generic

我们可以看到都是一些内核启动文件,很明显有些是我们不需要的,其实以上都还是我已经卸载了俩比较老的内核的情况了,没商量,不需要的就当垃圾处理掉。

首先请用uname -a看下自己当前启动的是哪个内核。

[email protected]:~$ uname -a

Linux expired 2.6.35-28-generic #49-Ubuntu SMP Tue Mar 1 14:39:03 UTC 2011 x86_64 GNU/Linux

从中可以看到我此刻启动的是2.6.35-28-generic,再用dpkg命令看下你的机器上都有哪些内核文件。

[email protected]:~$ dpkg -get-selections |grep linux-image

linux-image-2.6.35-22-generic deinstall

linux-image-2.6.35-24-generic deinstall

linux-image-2.6.35-25-generic install

linux-image-2.6.35-27-generic install

linux-image-2.6.35-28-generic install

linux-image-generic install

不少,理论上除正在用的都可以删除,但刚升级的东西可能不稳定,为保险起见,保留1-2个之前版本吧。

运行apt-get remove命令卸载不需要的内核。

[email protected]:~$ sudo apt-get remove linux-image-2.6.35-25-generic

The following packages will be REMOVED:

linux-image-2.6.35-25-generic

0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.

After this operation, 139MB disk space will be freed.

Do you want to continue [Y/n]? y

出现以上提示问是否继续,按y或者直接回车继续。完成后会有如下提示:

DKMS: uninstall Completed.

Examining /etc/kernel/postrm.d .

run-parts: executing /etc/kernel/postrm.d/initramfs-tools 2.6.35-25-generic /boot/vmlinuz-2.6.35-25-generic

run-parts: executing /etc/kernel/postrm.d/zz-update-grub 2.6.35-25-generic /boot/vmlinuz-2.6.35-25-generic

Generating grub.cfg …

Found linux image: /boot/vmlinuz-2.6.35-28-generic

Found initrd image: /boot/initrd.img-2.6.35-28-generic

Found linux image: /boot/vmlinuz-2.6.35-27-generic

Found initrd image: /boot/initrd.img-2.6.35-27-generic

Found memtest86+ image: /memtest86+.bin

Found Windows 7 (loader) on /dev/sda1

Found Windows Vista (loader) on /dev/sda4

done

现在的ubuntu会自动重建启动菜单grub.cfg,所以就一步到位了。卸载完后可以用df命令看下boot分区的空间使用情况。

[email protected]:~$ df

Filesystem 1K-blocks Used Available Use% Mounted on

/dev/sda9 19223252 9429624 8817144 52% /

/dev/sda7 93207 53279 35116 61% /boot

ok,已经腾出35m空间了,现在可以运行sudo apt-get upgrade升级了。

再用dpkg看下还剩什么东西。

[email protected]:~$ dpkg -get-selections | grep linux-image

linux-image-2.6.35-25-generic deinstall

linux-image-2.6.35-27-generic install

linux-image-2.6.35-28-generic install

linux-image-generic install

linux-image-2.6.35-25-generic 显示deinstall,表示已经删除,也许你觉得留着这个也不好看,那就重启后再运行一次卸载命令就可以了:

[email protected]:~$apt-get remove linux-image-2.6.35-25-generic

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