分类：linux

rpm -Uvh https://www.rabbitmq.com/releases/erlang/erlang-18.3-1.el6.x86_64.rpm
yum install -y socat
rpm -Uvh https://www.rabbitmq.com/releases/rabbitmq-server/v3.6.10/rabbitmq-server-3.6.10-1.el6.noarch.rpm

service rabbitmq-server restart
lsof -i:5672

<br />#install oracle java https://www.digitalocean.com/community/tutorials/how-to-install-java-on-ubuntu-with-apt-get
sudo apt-get install python-software-properties
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer

#ANDROIDSTUDIO
#necessary for mksdcard
sudo apt-get install lib32stdc++6

#edit ~/.profile and add env variables
export ANDROID_SDK="$HOME/android-sdk-linux"
PATH=$PATH:$ANDROID_SDK/platform-tools;$ANDROID_SDK/tools


##PREREQ
#Node.js >= 0.12
sudo apt-get install node.js

#ADB properly set up

#RethinkDB >= 2.2
source /etc/lsb-release && echo "deb http://download.rethinkdb.com/apt $DISTRIB_CODENAME main" | sudo tee /etc/apt/sources.list.d/rethinkdb.list
wget -qO- https://download.rethinkdb.com/apt/pubkey.gpg | sudo apt-key add -
sudo apt-get update
sudo apt-get install rethinkdb

#GraphicsMagick (for resizing screenshots)
sudo apt-get install graphicsmagick

#ZeroMQ libraries installed
sudo apt-get install libzmq1
sudo apt-get install libzmq-dev

#Protocol Buffers libraries installed (seems part of rethinkDB)
sudo apt-get install libprotobuf*

#yasm installed (for compiling embedded libjpeg-turbo)
sudo apt-get install yasm
sudo apt-get install npm
sudo apt-get install nodejs-legacy
npm install --save jpeg-turbo

#pkg-config so that Node.js can find the libraries
sudo apt-get install pkg-config

#node >=6.9 so install 8.x
curl -sL https://deb.nodesource.com/setup_8.x | bash
apt-get install nodejs

#add mirrors
npm config set registry https://registry.npm.taobao.org
npm config get registry

##STF
sudo apt-get install git
mkdir ~/stf
cd ~/stf
sudo npm install zmq
sudo npm install -g stf

##Continue here
https://github.com/openstf/stf/tree/2.0.0#running

# step 1, install caddyserver
curl -s https://getcaddy.com | bash
groupadd -g 33 www-data
useradd \
  -g www-data --no-user-group \
  --home-dir /var/www --no-create-home \
  --shell /usr/sbin/nologin \
  --system --uid 33 www-data

mkdir /etc/caddy
chown -R root:www-data /etc/caddy
mkdir /etc/ssl/caddy
chown -R www-data:root /etc/ssl/caddy
chmod 0770 /etc/ssl/caddy

# step 2, download sysvinit file
wget https://raw.githubusercontent.com/mholt/caddy/master/dist/init/linux-sysvinit/caddy -O /etc/init.d/caddy

# step 3, install daemon
cd /usr/local/src
wget http://developer.axis.com/download/distribution/apps-sys-utils-start-stop-daemon-IR1_9_18-2.tar.gz
tar zxvf apps-sys-utils-start-stop-daemon-IR1_9_18-2.tar.gz
cd apps/sys-utils/start-stop-daemon-IR1_9_18-2
gcc start-stop-daemon.c -o start-stop-daemon
cp start-stop-daemon /usr/sbin/

# step 4, start service
service caddy start

主要使用webp-tools

#ubuntu
apt-get install webp

#centos
yum -y install libwebp-devel libwebp-tools

会生成几个工具。

cwebp → WebP encoder tool
dwebp → WebP decoder tool
vwebp → WebP file viewer
webpmux → WebP muxing tool
gif2webp → Tool for converting GIF images to WebP

# convert from webp to png
dwebp mycat.jpg -o mycat.png

# Convert from JPG to WebP
cwebp some.jpg -o target.webp

dwebp可以将webp图片转换成无损的png图片格式，有了png，则可以使用imagemagic之类的工具再转换成jpg.
cwebp可以将jpg转换成webp，将png转换成webp

阿里云，香港，SSD云盘

[root@ali03 ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000
300000+0 records in
300000+0 records out
2457600000 bytes (2.5 GB) copied, 29.2894 s, 83.9 MB/s

腾讯云，新加坡，默认

[root@VM_0_2_centos ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000
300000+0 records in
300000+0 records out
2457600000 bytes (2.5 GB) copied, 3.70669 s, 663 MB/s

real    0m3.744s
user    0m0.040s
sys 0m2.450s

青云，北京3区，默认

[root@JY11 ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000
300000+0 records in
300000+0 records out
2457600000 bytes (2.5 GB) copied, 17.3187 s, 142 MB/s

real    0m17.365s
user    0m0.033s
sys 0m1.644s

一般是用crontab -e来增删计划任务，如果要导入任务，则可以通过复制文件的方式来操作

Mac OS X – /usr/lib/cron/tabs/ (user cron location /usr/lib/cron/tabs/vivek)
FreeBSD/OpenBSD/NetBSD – /var/cron/tabs/ (user cron location /var/cron/tabs/vivek)
CentOS/Red Hat/RHEL/Fedora/Scientific Linux – /var/spool/cron/ (user cron location /var/spool/cron/vivek)
Debian / Ubuntu Linux – /var/spool/cron/crontabs/ (user cron location /var/spool/cron/crontabs/vivek)
HP-UX Unix – /var/spool/cron/crontabs/ (user cron location /var/spool/cron/crontabs/vivek)
IBM AIX Unix – /var/spool/cron/ (user cron location /var/spool/cron/vivek)

我司的部分业务从去年起，开始接入OneApm，到目前已经有50台机器的规模。
业务层的Nginx、PHP、Mysql，到Redis、ElasticSearch监控，到业务模拟测试可用度，到自定义SDK实现的特殊业务监控，目前都有涉及到(http://www.4wei.cn/archives/1002578)。

总的来说，好评满满，DevOps时代不可或缺的必备工具服务。

20+监控服务器，Nginx、Mysql、ES、REDIS、PHP_FPM等数个平台服务的监控

配置自定义仪表盘

设置告警策略

公司内网的一台Linux弱口令机器让扫出来了，数据洗劫一空，悲剧啊
还好不是什么重要的东西，赶紧重装系统。

人不在公司，只能使用远程重装，方案如下：

Fedora 14需要下载的文件在http://nas1.itc.virginia.edu/fedora/releases/14/Fedora/x86_64/os/images/…
64位Centos需要下载的文件在 http://mirror.centos.org/centos-5/5/os/x86_64/images/pxeboot/

修改服务器的/boot/grub/grub.conf文件，在这个配置文件中，添加如下启动项：

title CentOS Reinstall
root (hd0,0)
kernel /vmlinuz vnc vncpassword=12345678 headless ip=10.36.64.238 netmask=255.255.255.0 gateway=10.36.64.254 dns=10.36.10.8 hostname=0map238 ksdevice=eth0 method=http://mirrors.163.com/centos/6/os/x86_64/ lang=
en_US keymap=us
initrd /initrd.img

在"hiddenmenu" 和 "title CentOS..." 增加一项:
method中的url为安装centos的源

重启后使用vnc软件连接服务器 IP:1 ,并输入刚刚设置的vnc密码即可进行centos的重装。这个过程中机器需要下载一些镜像，大约要等待15分钟，VNC才可以访问。

[txtplain]
--> Finished Dependency Resolution
Error: Multilib version problems found. This often means that the root
cause is something else and multilib version checking is just
pointing out that there is a problem. Eg.:

1. You have an upgrade for openssl which is missing some
dependency that another package requires. Yum is trying to
solve this by installing an older version of openssl of the
different architecture. If you exclude the bad architecture
yum will tell you what the root cause is (which package
requires what). You can try redoing the upgrade with
--exclude openssl.otherarch ... this should give you an error
message showing the root cause of the problem.

2. You have multiple architectures of openssl installed, but
yum can only see an upgrade for one of those arcitectures.
If you don't want/need both architectures anymore then you
can remove the one with the missing update and everything
will work.

3. You have duplicate versions of openssl installed already.
You can use "yum check" to get yum show these errors.

...you can also use --setopt=protected_multilib=false to remove
this checking, however this is almost never the correct thing to
do as something else is very likely to go wrong (often causing
much more problems).

Protected multilib versions: openssl-1.0.1e-42.el6_7.2.x86_64 != openssl-1.0.1e-42.el6.i686
[/txtplain]

原因未知，卸载掉openssl-1.0.1e-42.el6.i686即可

本文将介绍Linux下使用Shell处理文本时最常用的工具：
find、grep、xargs、sort、uniq、tr、cut、paste、wc、sed、awk；
提供的例子和参数都是最常用和最为实用的；
我对shell脚本使用的原则是命令单行书写，尽量不要超过2行；
如果有更为复杂的任务需求，还是考虑python吧；

继续阅读Linux Shell 文本处理工具集锦

(通过ADB命令查看wifi密码、MAC地址、设备信息、操作文件、查看文件、日志信息、卸载、启动和安装APK等)

ADB很强大，记住一些ADB命令有助于提高工作效率。

1. 获取序列号：

    adb get-serialno

2. 查看连接计算机的设备：

    adb devices

3. 重启机器：

    adb reboot

4. 重启到bootloader，即刷机模式：

    adb reboot bootloader

5. 重启到recovery，即恢复模式：

    adb reboot recovery

6. 查看log：

    adb logcat

7. 终止adb服务进程：

    adb kill-server

8. 重启adb服务进程：

    adb start-server

9. 获取机器MAC地址：

    adb shell  cat /sys/class/net/wlan0/address

10. 获取CPU序列号：

    adb shell cat /proc/cpuinfo

11. 安装APK：

    adb install <apkfile> //比如：adb install baidu.apk

12. 保留数据和缓存文件，重新安装apk：

    adb install -r <apkfile> //比如：adb install -r baidu.apk

13. 安装apk到sd卡：

    adb install -s <apkfile> // 比如：adb install -s baidu.apk

14. 卸载APK：

    adb uninstall <package> //比如：adb uninstall com.baidu.search

15. 卸载app但保留数据和缓存文件：

    adb uninstall -k <package> //比如：adb uninstall -k com.baidu.search

16. 启动应用：

    adb shell am start -n <package_name>/.<activity_class_name>

17. 查看设备cpu和内存占用情况：

    adb shell top

18. 查看占用内存前6的app：

    adb shell top -m 6

19. 刷新一次内存信息，然后返回：

    adb shell top -n 1

20. 查询各进程内存使用情况：

    adb shell procrank

21. 杀死一个进程：

    adb shell kill [pid]

22. 查看进程列表：

    adb shell ps

23. 查看指定进程状态：

    adb shell ps -x [PID]

24. 查看后台services信息：

    adb shell service list

25. 查看当前内存占用：

    adb shell cat /proc/meminfo

26. 查看IO内存分区：

    adb shell cat /proc/iomem

27. 将system分区重新挂载为可读写分区：

    adb remount

28. 从本地复制文件到设备：

    adb push <local> <remote>

29. 从设备复制文件到本地：

    adb pull <remote>  <local>

30. 列出目录下的文件和文件夹，等同于dos中的dir命令：

    adb shell ls

31. 进入文件夹，等同于dos中的cd 命令：

    adb shell cd <folder>

32. 重命名文件：

    adb shell rename path/oldfilename path/newfilename

33. 删除system/avi.apk：

    adb shell rm /system/avi.apk

34. 删除文件夹及其下面所有文件：

    adb shell rm -r <folder>

35. 移动文件：

    adb shell mv path/file newpath/file

36. 设置文件权限：

    adb shell chmod 777 /system/fonts/DroidSansFallback.ttf

37. 新建文件夹：

    adb shell mkdir path/foldelname

38. 查看文件内容：

    adb shell cat <file>

39. 查看wifi密码：

    adb shell cat /data/misc/wifi/*.conf

40. 清除log缓存：

    adb logcat -c

41. 查看bug报告：

    adb bugreport

42. 获取设备名称：

    adb shell cat /system/build.prop

43. 查看ADB帮助：

    adb help

44. 跑monkey：

    adb shell monkey -v -p your.package.name 500

More:

• 如何获得Android设备名称(ADB命令详细介绍)
• 官方说明

cat /dev/null > /var/log/wtmp
cat /dev/null > /var/log/messages
cat /dev/null > /var/log/secure
cat /dev/null > /var/log/lastlog
rm -f /var/log/wtmp*
rm -f /root/.bash_history
touch .hushlogin
history -c

cat /dev/null > /var/log/syslog
cat /dev/null > /var/adm/sylog
cat /dev/null > /var/log/wtmp
cat /dev/null > /var/log/maillog
cat /dev/null > /var/log/messages
cat /dev/null > /var/log/openwebmail.log
cat /dev/null > /var/log/maillog
cat /dev/null > /var/log/secure
cat /dev/null > /var/log/httpd/error_log
cat /dev/null > /var/log/httpd/ssl_error_log
cat /dev/null > /var/log/httpd/ssl_request_log
cat /dev/null > /var/log/httpd/ssl_access_log