zlib

Nginx搭建负载均衡集群

送分小仙女□ 提交于 2021-02-13 07:18:55
(1).实验环境 youxi1  192.168.5.101  负载均衡器 youxi2  192.168.5.102  主机1 youxi3  192.168.5.103  主机2 (2).Nginx负载均衡策略   nginx的负载均衡用于upstream模板定义的后端服务器列表中选取一台服务器接收用户的请求。一个基本的upstream模块如下: upstream [服务器组名称]{   server [IP地址]:[端口号];   server [IP地址]:[端口号];   .... }   在upstream模块配置完成后,要让指定的访问反向代理到服务器列表,格式如下: location ~ .*$ {   index index.jsp index.html;   proxy_pass http://[服务器组名称]; }   扩展:nginx的location配置规则: http://outofmemory.cn/code-snippet/742/nginx-location-configuration-xiangxi-explain   这样就完成了最基本的负载均衡,但是这并不能满足实际需求。目前Nginx的upstream模块支持6种方式的负载均衡策略(算法):轮询(默认方式)、weight(权重方式)、ip_hash(依据ip分配方式)、least_conn

python 常用的标准库

…衆ロ難τιáo~ 提交于 2021-02-13 07:18:17
glob模块 提供了一个函数,用于匹配符合要求的文件: import glob list =glob.glob( " *.py " ) # 匹配当前目录下的所有匹配的文件名(包括后缀),以字符串列表的形式返回 print (list) # ['test.py', 'test2.py'] re模块 字符串正则匹配 import re list =re.findall(r " \bh " , " hi hello his " ) # 获取所有符合要求的匹配,以字符串列表的形式返回 print (list) # ['h', 'h', 'h'] str =re.sub(r " \bh " , " H " , " hi hello his " ) # 用第二个字符串替换第一个正则表达式匹配到的所有子串。字符串不可变,以副本形式返回。 print (str) # Hi Hello His datetime模块 日期时间 from datetime import date now = date.today() print (now) # 2019-08-07,这是默认的格式 print (now.strftime( " %Y.%m.%d " )) # 2019.08.07 格式化时间日期,返回的是时间日期对象对应的字符串 # print(now.strftime("%Y年%m月%d日"))

玩转Linux必备的金钥匙之源码安装mysql依赖程序

我的未来我决定 提交于 2021-02-08 09:51:22
安装mysql依赖程序 提示:先保证网络畅通,虚拟机则选择nat模式,不同情况安装的linux系统,需要的依赖包数量版本不一样,最小安装的依赖包就需要多装一些,您的系统版本老可能依赖包版本也不能过高,否则不兼容。 cmake 提示:这些依赖包,也有自己需要的依赖包,先安装它所需依赖包再安装cmake,顺序不能变,否则会缓存错误信息即便清除缓存正确安装也无法解决, cmake包可以下载好挂载,也可以执行此命令在线下载wget https://dl.bintray.com/boostorg/release/1.64.0/source/boost_1_64_0.tar.gz 1、 安装或升级依赖包 用yum联网自动安装依赖包:yum -y install gcc gcc-c++ make libtool zlib zlib-devel pcre pcre-devel openssl openssl-devel 2、 解压、 bootstrap编译 3、 编译并安装 以上步骤不报错,下面很容易执行:gmake && gmake install 和女朋友出去逛逛街再回来,这个操作需要30分钟。查看版本即可。 安装boost 提示:也是要先安装它所需要的依赖包(奇妙吧,依赖包也有依赖包要预先安装) 1、解压 tar zxf /mnt/boost_1_59_0.tar.gz -C /usr

How to stream a gzip built on the fly in Python?

て烟熏妆下的殇ゞ 提交于 2021-02-08 09:51:15
问题 I'd like to stream a big log file over the network using asyncio. I retrieve the data from the database, format it, compress it using python's zlib and stream it over the network. Here is basically the code I use: @asyncio.coroutine def logs(requests): # ... yield from resp.prepare(request) # gzip magic number and compression format resp.write(b'\x1f\x8b\x08\x00\x00\x00\x00\x00') compressor = compressobj() for row in rows: ip, uid, date, url, answer, volume = row NCSA_ROW = '{} {} - [{}] "GET

gzinflate in Java

流过昼夜 提交于 2021-02-08 04:38:22
问题 So, my Java application reveives some data that is generated with PHP's gzdeflate(). Now i'm trying to inflate that data with Java. This is what i've got so far: InflaterInputStream inflInstream = new InflaterInputStream(new ByteArrayInputStream(inputData.getBytes() ), new Inflater()); byte bytes[] = new byte[1024]; while (true) { int length = inflInstream.read(bytes, 0, 1024); if (length == -1) break; System.out.write(bytes, 0, length); } 'inputData' is a String containing the deflated data.

Can't install and use Cabal (Haskell) on CentOS Server - zlib-0.5.4.1 failed during the building phase

我的未来我决定 提交于 2021-02-07 18:38:18
问题 I'm trying to install a Haskell server which runs in Cabal on my server. When I configure a server normally to run this, I follow these instructions which we've refined - they work 100% every time on a blank rackspace cloud server. yum update yum install git yum install vim yum install ghc-zlib-devel.x86_64 wget http://www.haskell.org/ghc/dist/7.8.2/ghc-7.8.2-x86_64-unknown-linux-centos65.tar.xz wget http://www.haskell.org/cabal/release/cabal-install-1.20.0.1/cabal-x86_64-unknown-linux.tar.gz

Compression ratios for different zlib compression levels

夙愿已清 提交于 2021-02-07 18:29:40
问题 I am considering what level of zlib compression to use, and I am curious about the different compression rates for the different compression levels that can be specified in zlib commands. The zlib manual has the following constants for specifying the compression level: #define Z_NO_COMPRESSION 0 #define Z_BEST_SPEED 1 #define Z_BEST_COMPRESSION 9 #define Z_DEFAULT_COMPRESSION (-1) Clearly, a lower the number means lower latency for compression and deflation at the cost of a less-compressed

Java Decompress a string compressed with zlib deflate

半腔热情 提交于 2021-02-07 06:35:05
问题 As the title says. How do you decompress a compressed string which was compressed with zlib deflate? What is the solid way of doing it with an explanation? 回答1: Try this - it is a minimal working example: package zlib.example; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.util.Arrays; import java.util.zip.Deflater; import java.util.zip.DeflaterOutputStream; import java.util.zip.InflaterInputStream; /** * Created by keocra on 08.10.15. */ public class

Java Decompress a string compressed with zlib deflate

帅比萌擦擦* 提交于 2021-02-07 06:35:02
问题 As the title says. How do you decompress a compressed string which was compressed with zlib deflate? What is the solid way of doing it with an explanation? 回答1: Try this - it is a minimal working example: package zlib.example; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.util.Arrays; import java.util.zip.Deflater; import java.util.zip.DeflaterOutputStream; import java.util.zip.InflaterInputStream; /** * Created by keocra on 08.10.15. */ public class

Python equivalent of unix cksum function

前提是你 提交于 2021-02-06 15:18:01
问题 I've been looking for the equivalent python method for the unix cksum command: http://pubs.opengroup.org/onlinepubs/7990989775/xcu/cksum.html $ cksum ./temp.bin 1605138151 712368 ./temp.bin So far I have found the zlib.crc32() function >>> import zlib >>> f = open('./temp.bin','rb') >>> data = f.read() >>> zlib.crc32(data) 1128751837 However this code appears to produce different results. As far as I can tell this should be using the same crc polynomial but I imagine there must be some