最近阿里雲ECS貌似有點不穩定啊，今天踩了兩個坑。
一、ssh遠程訪問有問題
我xshell遠程訪問時斷時續，後來乾脆登不上去了，提示錯誤：
Socket error Event: 32 Error: 10053. Disconnected from remote host
關鍵我在同一臺電腦上使用阿里雲提供的網頁遠程功能卻可以遠程訪問。
網上試了一些方法都沒效果，比如有
說IP地址衝突的，修改爲固定IP；有說key的權限問題的，重新生成key，並配置權限；有說IP被阿里禁了，怎麼可能，web端訪問正常；有說沒有在ECS安全組裏配置端口的，之前都配置了；有說是xshell的問題，換了個putty還是不行；最後連重啓大法都試了。無奈，吃了個午飯回來居然神奇般地能遠程訪問了。到現在我也沒弄明白是爲什麼，真是佛系，希望有踏過類似坑的大佬幫忙解答。
二、更新系統後，apt源出問題
今天用xshell更新了下阿里雲ECS系統，提示有更新，強迫症的我就更新了，更新完之後apt的源居然出問題了，
apt-get clean apt-get update aptitude update 都用不了了
下面是更新之後的apt源： /etc/apt/sources.list
1 ## Note, this file is written by cloud-init on first boot of an instance
2 ## modifications made here will not survive a re-bundle.
3 ## if you wish to make changes you can:
4 ## a.) add 'apt_preserve_sources_list: true' to /etc/cloud/cloud.cfg
5 ## or do the same in user-data
6 ## b.) add sources in /etc/apt/sources.list.d
7 ## c.) make changes to template file /etc/cloud/templates/sources.list.tmpl
8
9 # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
10 # newer versions of the distribution.
11
12 deb http://mirrors.cloud.aliyun.com/ubuntu/ bionic main
13 deb-src http://mirrors.cloud.aliyun.com/ubuntu/ bionic main
14
15 ## Major bug fix updates produced after the final release of the
16 ## distribution.
17 deb http://mirrors.cloud.aliyuncs.com/ubuntu/ bionic-updates main
18 deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ bionic-updates main
19
20 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
21 ## team. Also, please note that software in universe WILL NOT receive any
22 ## review or updates from the Ubuntu security team.
23 deb http://mirrors.cloud.aliyuncs.com/ubuntu/ bionic universe
24 deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ bionic universe
25 deb http://mirrors.cloud.aliyuncs.com/ubuntu/ bionic-updates universe
26 deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ bionic-updates universe
27
28 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
29 ## team, and may not be under a free licence. Please satisfy yourself as to
30 ## your rights to use the software. Also, please note that software in
31 ## multiverse WILL NOT receive any review or updates from the Ubuntu
32 ## security team.
33 deb http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial multiverse
34 deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial multiverse
35 deb http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial-updates multiverse
36 deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial-updates multiverse
37
38 ## Uncomment the following two lines to add software from the 'backports'
39 ## repository.
40 ## N.B. software from this repository may not have been tested as
41 ## extensively as that contained in the main release, although it includes
42 ## newer versions of some applications which may provide useful features.
43 ## Also, please note that software in backports WILL NOT receive any review
44 ## or updates from the Ubuntu security team.
45 deb http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial-backports main restricted universe multiverse
46 deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial-backports main restricted universe multiverse
47
48 ## Uncomment the following two lines to add software from Canonical's
49 ## 'partner' repository.
50 ## This software is not part of Ubuntu, but is offered by Canonical and the
51 ## respective vendors as a service to Ubuntu users.
52 # deb http://archive.canonical.com/ubuntu xenial partner
53 # deb-src http://archive.canonical.com/ubuntu xenial partner
54
55 #deb http://mirrors.cloud.aliyun.com/ubuntu bionic-security main
56 #deb-src http://mirrors.cloud.aliyun.com/ubuntu bionic-security main
57 #deb http://mirrors.cloud.aliyun.com/ubuntu bionic-security universe
58 #deb-src http://mirrors.cloud.aliyun.com/ubuntu bionic-security universe
59 # deb http://mirrors.cloud.aliyuncs.com/ubuntu xenial-security multiverse
60 # deb-src http://mirrors.cloud.aliyuncs.com/ubuntu xenial-security multiverse
搞了半天，阿里雲的apt源居然打不開 http://mirrors.cloud.aliyun.com/ubuntu/
最後換了別的源搞定，這裏推薦幾個比較好用的吧：
清華大學的源 https://mirrors.tuna.tsinghua.edu.cn/help/ubuntu/
中科大的源 http://mirrors.ustc.edu.cn/
完畢！