我在Amazon Linux实例上运行sudo yum update ，并更新了内核。 在我见过的其他故事中，当您loginSystem Restart Required时会导致出现一条消息。 为什么我在这里看不到？
Last login: Mon Jun 2 17:06:11 2014 from ... __| __|_ ) _| ( / Amazon Linux AMI ___|\___|___| https://aws.amazon.com/amazon-linux-ami/2014.03-release-notes/ [myuser@dev ~]$ uname -a Linux dev.myhost.com.au 3.4.82-69.112.amzn1.x86_64 #1 SMP Mon Feb 24 16:31:21 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux [myuser@dev ~]$ cd /boot [myuser@dev boot]$ ls -l total 45208 -rw-r--r-- 1 root root 80189 May 6 04:31 config-3.10.38-49.136.amzn1.x86_64 -rw-r--r-- 1 root root 80189 May 14 07:38 config-3.10.40-50.136.amzn1.x86_64 -rw-r--r-- 1 root root 70178 Feb 25 03:36 config-3.4.82-69.112.amzn1.x86_64 drwxr-xr-x 2 root root 4096 Jun 2 17:07 grub -rw------- 1 root root 10203096 May 12 03:58 initramfs-3.10.38-49.136.amzn1.x86_64.img -rw------- 1 root root 10203665 Jun 2 17:07 initramfs-3.10.40-50.136.amzn1.x86_64.img -rw------- 1 root root 8777362 Mar 4 23:18 initramfs-3.4.82-69.112.amzn1.x86_64.img -rw-r--r-- 1 root root 128784 May 6 04:31 symvers-3.10.38-49.136.amzn1.x86_64.gz -rw-r--r-- 1 root root 128805 May 14 07:38 symvers-3.10.40-50.136.amzn1.x86_64.gz -rw------- 1 root root 2201080 May 6 04:31 System.map-3.10.38-49.136.amzn1.x86_64 -rw------- 1 root root 2201155 May 14 07:38 System.map-3.10.40-50.136.amzn1.x86_64 -rw------- 1 root root 1727495 Feb 25 03:36 System.map-3.4.82-69.112.amzn1.x86_64 -rwxr-xr-x 1 root root 3657552 May 6 04:31 vmlinuz-3.10.38-49.136.amzn1.x86_64 -rwxr-xr-x 1 root root 3659152 May 14 07:38 vmlinuz-3.10.40-50.136.amzn1.x86_64 -rwxr-xr-x 1 root root 3145488 Feb 25 03:36 vmlinuz-3.4.82-69.112.amzn1.x86_64 [myuser@dev boot]$ cat grub/grub.conf # created by imagebuilder default=0 timeout=1 hiddenmenu title Amazon Linux 2014.03 (3.10.40-50.136.amzn1.x86_64) root (hd0) kernel /boot/vmlinuz-3.10.40-50.136.amzn1.x86_64 root=LABEL=/ console=hvc0 LANG=en_US.UTF-8 KEYTABLE=us initrd /boot/initramfs-3.10.40-50.136.amzn1.x86_64.img title Amazon Linux 2014.03 (3.10.38-49.136.amzn1.x86_64) root (hd0) kernel /boot/vmlinuz-3.10.38-49.136.amzn1.x86_64 root=LABEL=/ console=hvc0 LANG=en_US.UTF-8 KEYTABLE=us initrd /boot/initramfs-3.10.38-49.136.amzn1.x86_64.img title Amazon Linux 2013.09 (3.4.82-69.112.amzn1.x86_64) root (hd0) kernel /boot/vmlinuz-3.4.82-69.112.amzn1.x86_64 root=LABEL=/ console=hvc0 LANG=en_US.UTF-8 KEYTABLE=us initrd /boot/initramfs-3.4.82-69.112.amzn1.x86_64.img
重新启动系统并确认新内核正在运行…
Last login: Thu Jun 5 10:55:30 2014 from ... __| __|_ ) _| ( / Amazon Linux AMI ___|\___|___| https://aws.amazon.com/amazon-linux-ami/2014.03-release-notes/ [myuser@dev ~]$ uname -a Linux dev.myhost.com.au 3.10.40-50.136.amzn1.x86_64 #1 SMP Tue May 13 21:35:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
这主要是一个Ubuntu的东西（我想Debian）。 它是update-motd系统的一部分，在/etc/update-motd.d中有一堆脚本，偶尔会重写当您第一次login时显示的“每日消息”。 下面是Ubuntu wiki页面
Amazon Linux源自红帽企业Linux（即，您使用“yum”而不是“apt”），并且显然没有当天系统的dynamic消息。