tomcat集群学习记录1--初识apache http server

时间:2023-03-08 17:23:49

起因

  平时开发的时候我都是用eclipse把代码部署到本地tomcat的,当然只会去跑1台tomcat啦...

  偶尔有时候解决问题需要去公司测试环境找日志.连上公司测试环境以后发现竟然有2台weblogic服务器..日志有时候会刷在服务器a,有时候会刷在服务器b...瞬间感觉高大上...于是想自己也研究研究...所以就有了这篇文章....

尝试Nginx

  我刚开始研究的是nginx...因为大四来公司面试架构师和我聊天的时候就提到它blablabla...反正我也听不懂...只是知道有这么1个东西,可以做为反向代理服务器...所以现在就下载来研究研究...

  总的来说它配置真的很简单(和apache比)...http://nginx.org/en/docs/beginners_guide.html 反正仅仅看了这篇官网入门文章就能轻松的配置好了...但是有个地方有点纠结...nginx在反向代理的时候提供了几种选择:

1.轮询 这是默认的方案...很好理解..如果配置了2台后台的服务器...那就1次请求分给服务器a,1次请求分给服务器b...简单粗暴...

2.权重 轮询的加强版...可以按权重分配给服务器a,b

3.IP_hash 根据IP算出来如果你是分配在服务器a,那IP不变化的话你怎么请求后续都是分配在a....

  然后我问了一下架构师...测试环境在前台是用nginx吗?是IP_hash方案吗...因为轮询和权重是明显不可能的..因为多台服务器session会有共享问题的..我在代码里也没有看到什么保证session共享的配置...

  结果是测试环境用的是apache..不是根据IP来分的,是根据session...

  我想:这好像很有道理...因为根据IP来分的话是有可能一个局域网内的用户会分到同一台服务器上...可能负载会不均衡...

  于是我搜索了下Nginx有没有办法这样做...发现是有的..有模块可以做到的..但是windows下没有..只有linux的..我学习的环境是windows...所以我就暂时不研究nginx了..去研究apache http server去了..

尝试Apache

  我去网上下载了windows版本的..具体版本号是2.2.19

  配置文件是conf下的httpd.conf...根据网上的做法要开启一些模块才能启用反向代理...但是有很多貌似是不需要开启的...比如我的tomcat用的是http的方式.不是ajp..那我就不需要开启ajp的模块...所以开启

LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule proxy_module modules/mod_proxy.so

应该就足够了...

然后要配置反向代理的设置.

conf中是可以引入其他conf文件的...通过Include XXX.conf就可以了...

我就直接写在这个httpd.conf里了...简单粗暴...省的多个文件找来找去..

我在httpd.conf的最后加上了

<VirtualHost *:80>
ProxyRequests Off
ProxyPass / balancer://testcluster/ stickysession=JSESSIONID
#ProxyPassReverse / balancer://testcluster/ #ProxyPass / http://localhost:8082/
#ProxyPassReverse / http://localhost:8082/ <Proxy balancer://testcluster>
BalancerMember http://localhost:8082/ loadfactor=1 route=server2
BalancerMember http://localhost:8080/ loadfactor=1 route=server1
</Proxy>
</VirtualHost>

loadfactor就是服务器的权重

stickysession=JSESSIONID就是根据cookie里的JSESSIONID来判断分发给哪台服务器

route=XX,就是根据jsessionid的最后几个字符是server1还是server2来判断分发给哪台服务器

ProxyPassReverse网上都是配置了,和ProxyPass 的值一样..但是我好像不配也可以运行..不知道什么原理...(2016.4.14:查阅资料,解释是页面重定向的时候如果没有配置这个会跳转到重定向的域名,所以这个配置还是要的)

完整的conf如下

#
# This is the main Apache HTTP server configuration file. It contains the
# configuration directives that give the server its instructions.
# See <URL:http://httpd.apache.org/docs/2.2> for detailed information.
# In particular, see
# <URL:http://httpd.apache.org/docs/2.2/mod/directives.html>
# for a discussion of each configuration directive.
#
# Do NOT simply read the instructions in here without understanding
# what they do. They're here only as hints or reminders. If you are unsure
# consult the online docs. You have been warned.
#
# Configuration and logfile names: If the filenames you specify for many
# of the server's control files begin with "/" (or "drive:/" for Win32), the
# server will use that explicit path. If the filenames do *not* begin
# with "/", the value of ServerRoot is prepended -- so "logs/foo.log"
# with ServerRoot set to "D:/jet/apache" will be interpreted by the
# server as "D:/jet/apache/logs/foo.log".
#
# NOTE: Where filenames are specified, you must use forward slashes
# instead of backslashes (e.g., "c:/apache" instead of "c:\apache").
# If a drive letter is omitted, the drive on which httpd.exe is located
# will be used by default. It is recommended that you always supply
# an explicit drive letter in absolute paths to avoid confusion. #
# ServerRoot: The top of the directory tree under which the server's
# configuration, error, and log files are kept.
#
# Do not add a slash at the end of the directory path. If you point
# ServerRoot at a non-local disk, be sure to point the LockFile directive
# at a local disk. If you wish to share the same ServerRoot for multiple
# httpd daemons, you will need to change at least LockFile and PidFile.
#
ServerRoot "D:/jet/apache" #
# Listen: Allows you to bind Apache to specific IP addresses and/or
# ports, instead of the default. See also the <VirtualHost>
# directive.
#
# Change this to Listen on specific IP addresses as shown below to
# prevent Apache from glomming onto all bound IP addresses.
#
#Listen 12.34.56.78:80
Listen 80 #
# Dynamic Shared Object (DSO) Support
#
# To be able to use the functionality of a module which was built as a DSO you
# have to place corresponding `LoadModule' lines at this location so the
# directives contained in it are actually available _before_ they are used.
# Statically compiled modules (those listed by `httpd -l') do not need
# to be loaded here.
#
# Example:
# LoadModule foo_module modules/mod_foo.so
#
LoadModule actions_module modules/mod_actions.so
LoadModule alias_module modules/mod_alias.so
LoadModule asis_module modules/mod_asis.so
LoadModule auth_basic_module modules/mod_auth_basic.so
#LoadModule auth_digest_module modules/mod_auth_digest.so
#LoadModule authn_alias_module modules/mod_authn_alias.so
#LoadModule authn_anon_module modules/mod_authn_anon.so
#LoadModule authn_dbd_module modules/mod_authn_dbd.so
#LoadModule authn_dbm_module modules/mod_authn_dbm.so
LoadModule authn_default_module modules/mod_authn_default.so
LoadModule authn_file_module modules/mod_authn_file.so
#LoadModule authnz_ldap_module modules/mod_authnz_ldap.so
#LoadModule authz_dbm_module modules/mod_authz_dbm.so
LoadModule authz_default_module modules/mod_authz_default.so
LoadModule authz_groupfile_module modules/mod_authz_groupfile.so
LoadModule authz_host_module modules/mod_authz_host.so
#LoadModule authz_owner_module modules/mod_authz_owner.so
LoadModule authz_user_module modules/mod_authz_user.so
LoadModule autoindex_module modules/mod_autoindex.so
#LoadModule cache_module modules/mod_cache.so
#LoadModule cern_meta_module modules/mod_cern_meta.so
LoadModule cgi_module modules/mod_cgi.so
#LoadModule charset_lite_module modules/mod_charset_lite.so
#LoadModule dav_module modules/mod_dav.so
#LoadModule dav_fs_module modules/mod_dav_fs.so
#LoadModule dav_lock_module modules/mod_dav_lock.so
#LoadModule dbd_module modules/mod_dbd.so
#LoadModule deflate_module modules/mod_deflate.so
LoadModule dir_module modules/mod_dir.so
#LoadModule disk_cache_module modules/mod_disk_cache.so
#LoadModule dumpio_module modules/mod_dumpio.so
LoadModule env_module modules/mod_env.so
#LoadModule expires_module modules/mod_expires.so
#LoadModule ext_filter_module modules/mod_ext_filter.so
#LoadModule file_cache_module modules/mod_file_cache.so
#LoadModule filter_module modules/mod_filter.so
#LoadModule headers_module modules/mod_headers.so
#LoadModule ident_module modules/mod_ident.so
#LoadModule imagemap_module modules/mod_imagemap.so
LoadModule include_module modules/mod_include.so
#LoadModule info_module modules/mod_info.so
LoadModule isapi_module modules/mod_isapi.so
#LoadModule ldap_module modules/mod_ldap.so
#LoadModule logio_module modules/mod_logio.so
LoadModule log_config_module modules/mod_log_config.so
#LoadModule log_forensic_module modules/mod_log_forensic.so
#LoadModule mem_cache_module modules/mod_mem_cache.so
LoadModule mime_module modules/mod_mime.so
#LoadModule mime_magic_module modules/mod_mime_magic.so
LoadModule negotiation_module modules/mod_negotiation.so
LoadModule proxy_module modules/mod_proxy.so
#LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
#LoadModule proxy_connect_module modules/mod_proxy_connect.so
#LoadModule proxy_ftp_module modules/mod_proxy_ftp.so
LoadModule proxy_http_module modules/mod_proxy_http.so
#LoadModule proxy_scgi_module modules/mod_proxy_scgi.so
#LoadModule reqtimeout_module modules/mod_reqtimeout.so
#LoadModule rewrite_module modules/mod_rewrite.so
LoadModule setenvif_module modules/mod_setenvif.so
#LoadModule speling_module modules/mod_speling.so
#LoadModule ssl_module modules/mod_ssl.so
#LoadModule status_module modules/mod_status.so
#LoadModule substitute_module modules/mod_substitute.so
#LoadModule unique_id_module modules/mod_unique_id.so
#LoadModule userdir_module modules/mod_userdir.so
#LoadModule usertrack_module modules/mod_usertrack.so
#LoadModule version_module modules/mod_version.so
#LoadModule vhost_alias_module modules/mod_vhost_alias.so <IfModule !mpm_netware_module>
<IfModule !mpm_winnt_module>
#
# If you wish httpd to run as a different user or group, you must run
# httpd as root initially and it will switch.
#
# User/Group: The name (or #number) of the user/group to run httpd as.
# It is usually good practice to create a dedicated user and group for
# running httpd, as with most system services.
#
User daemon
Group daemon </IfModule>
</IfModule> # 'Main' server configuration
#
# The directives in this section set up the values used by the 'main'
# server, which responds to any requests that aren't handled by a
# <VirtualHost> definition. These values also provide defaults for
# any <VirtualHost> containers you may define later in the file.
#
# All of these directives may appear inside <VirtualHost> containers,
# in which case these default settings will be overridden for the
# virtual host being defined.
# #
# ServerAdmin: Your address, where problems with the server should be
# e-mailed. This address appears on some server-generated pages, such
# as error documents. e.g. admin@your-domain.com
#
ServerAdmin admin@servyou.local #
# ServerName gives the name and port that the server uses to identify itself.
# This can often be determined automatically, but we recommend you specify
# it explicitly to prevent problems during startup.
#
# If your host doesn't have a registered DNS name, enter its IP address here.
#
#ServerName 020103211-PC.servyou.local:80 #
# DocumentRoot: The directory out of which you will serve your
# documents. By default, all requests are taken from this directory, but
# symbolic links and aliases may be used to point to other locations.
#
DocumentRoot "D:/jet/apache/htdocs" #
# Each directory to which Apache has access can be configured with respect
# to which services and features are allowed and/or disabled in that
# directory (and its subdirectories).
#
# First, we configure the "default" to be a very restrictive set of
# features.
#
<Directory />
Options FollowSymLinks
AllowOverride None
Order allow,deny
Deny from all
#Allow from all
</Directory> #
# Note that from this point forward you must specifically allow
# particular features to be enabled - so if something's not working as
# you might expect, make sure that you have specifically enabled it
# below.
# #
# This should be changed to whatever you set DocumentRoot to.
#
<Directory "D:/jet/apache/htdocs">
#
# Possible values for the Options directive are "None", "All",
# or any combination of:
# Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
#
# Note that "MultiViews" must be named *explicitly* --- "Options All"
# doesn't give it to you.
#
# The Options directive is both complicated and important. Please see
# http://httpd.apache.org/docs/2.2/mod/core.html#options
# for more information.
#
Options Indexes FollowSymLinks #
# AllowOverride controls what directives may be placed in .htaccess files.
# It can be "All", "None", or any combination of the keywords:
# Options FileInfo AuthConfig Limit
#
AllowOverride None #
# Controls who can get stuff from this server.
#
Order allow,deny
Allow from all </Directory> #
# DirectoryIndex: sets the file that Apache will serve if a directory
# is requested.
#
<IfModule dir_module>
DirectoryIndex index.html
</IfModule> #
# The following lines prevent .htaccess and .htpasswd files from being
# viewed by Web clients.
#
<FilesMatch "^\.ht">
Order allow,deny
Deny from all
Satisfy All
</FilesMatch> #
# ErrorLog: The location of the error log file.
# If you do not specify an ErrorLog directive within a <VirtualHost>
# container, error messages relating to that virtual host will be
# logged here. If you *do* define an error logfile for a <VirtualHost>
# container, that host's errors will be logged there and not here.
#
ErrorLog "logs/error.log" #
# LogLevel: Control the number of messages logged to the error_log.
# Possible values include: debug, info, notice, warn, error, crit,
# alert, emerg.
#
LogLevel warn <IfModule log_config_module>
#
# The following directives define some format nicknames for use with
# a CustomLog directive (see below).
#
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %b" common <IfModule logio_module>
# You need to enable mod_logio.c to use %I and %O
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio
</IfModule> #
# The location and format of the access logfile (Common Logfile Format).
# If you do not define any access logfiles within a <VirtualHost>
# container, they will be logged here. Contrariwise, if you *do*
# define per-<VirtualHost> access logfiles, transactions will be
# logged therein and *not* in this file.
#
CustomLog "logs/access.log" common #
# If you prefer a logfile with access, agent, and referer information
# (Combined Logfile Format) you can use the following directive.
#
#CustomLog "logs/access.log" combined
</IfModule> <IfModule alias_module>
#
# Redirect: Allows you to tell clients about documents that used to
# exist in your server's namespace, but do not anymore. The client
# will make a new request for the document at its new location.
# Example:
# Redirect permanent /foo http://020103211-PC.servyou.local/bar #
# Alias: Maps web paths into filesystem paths and is used to
# access content that does not live under the DocumentRoot.
# Example:
# Alias /webpath /full/filesystem/path
#
# If you include a trailing / on /webpath then the server will
# require it to be present in the URL. You will also likely
# need to provide a <Directory> section to allow access to
# the filesystem path. #
# ScriptAlias: This controls which directories contain server scripts.
# ScriptAliases are essentially the same as Aliases, except that
# documents in the target directory are treated as applications and
# run by the server when requested rather than as documents sent to the
# client. The same rules about trailing "/" apply to ScriptAlias
# directives as to Alias.
#
ScriptAlias /cgi-bin/ "D:/jet/apache/cgi-bin/" </IfModule> <IfModule cgid_module>
#
# ScriptSock: On threaded servers, designate the path to the UNIX
# socket used to communicate with the CGI daemon of mod_cgid.
#
#Scriptsock logs/cgisock
</IfModule> #
# "D:/jet/apache/cgi-bin" should be changed to whatever your ScriptAliased
# CGI directory exists, if you have that configured.
#
<Directory "D:/jet/apache/cgi-bin">
#AllowOverride None
#Options None
Order deny,allow
Allow from all
</Directory> #
# DefaultType: the default MIME type the server will use for a document
# if it cannot otherwise determine one, such as from filename extensions.
# If your server contains mostly text or HTML documents, "text/plain" is
# a good value. If most of your content is binary, such as applications
# or images, you may want to use "application/octet-stream" instead to
# keep browsers from trying to display binary files as though they are
# text.
#
DefaultType text/plain <IfModule mime_module>
#
# TypesConfig points to the file containing the list of mappings from
# filename extension to MIME-type.
#
TypesConfig conf/mime.types #
# AddType allows you to add to or override the MIME configuration
# file specified in TypesConfig for specific file types.
#
#AddType application/x-gzip .tgz
#
# AddEncoding allows you to have certain browsers uncompress
# information on the fly. Note: Not all browsers support this.
#
#AddEncoding x-compress .Z
#AddEncoding x-gzip .gz .tgz
#
# If the AddEncoding directives above are commented-out, then you
# probably should define those extensions to indicate media types:
#
AddType application/x-compress .Z
AddType application/x-gzip .gz .tgz #
# AddHandler allows you to map certain file extensions to "handlers":
# actions unrelated to filetype. These can be either built into the server
# or added with the Action directive (see below)
#
# To use CGI scripts outside of ScriptAliased directories:
# (You will also need to add "ExecCGI" to the "Options" directive.)
#
#AddHandler cgi-script .cgi # For type maps (negotiated resources):
#AddHandler type-map var #
# Filters allow you to process content before it is sent to the client.
#
# To parse .shtml files for server-side includes (SSI):
# (You will also need to add "Includes" to the "Options" directive.)
#
#AddType text/html .shtml
#AddOutputFilter INCLUDES .shtml
</IfModule> #
# The mod_mime_magic module allows the server to use various hints from the
# contents of the file itself to determine its type. The MIMEMagicFile
# directive tells the module where the hint definitions are located.
#
#MIMEMagicFile conf/magic #
# Customizable error responses come in three flavors:
# 1) plain text 2) local redirects 3) external redirects
#
# Some examples:
#ErrorDocument 500 "The server made a boo boo."
#ErrorDocument 404 /missing.html
#ErrorDocument 404 "/cgi-bin/missing_handler.pl"
#ErrorDocument 402 http://020103211-PC.servyou.local/subscription_info.html
# #
# EnableMMAP and EnableSendfile: On systems that support it,
# memory-mapping or the sendfile syscall is used to deliver
# files. This usually improves server performance, but must
# be turned off when serving from networked-mounted
# filesystems or if support for these functions is otherwise
# broken on your system.
#
#EnableMMAP off
#EnableSendfile off # Supplemental configuration
#
# The configuration files in the conf/extra/ directory can be
# included to add extra features or to modify the default configuration of
# the server, or you may simply copy their contents here and change as
# necessary. # Server-pool management (MPM specific)
#Include conf/extra/httpd-mpm.conf # Multi-language error messages
#Include conf/extra/httpd-multilang-errordoc.conf # Fancy directory listings
#Include conf/extra/httpd-autoindex.conf # Language settings
#Include conf/extra/httpd-languages.conf # User home directories
#Include conf/extra/httpd-userdir.conf # Real-time info on requests and configuration
#Include conf/extra/httpd-info.conf # Virtual hosts
#Include conf/extra/httpd-vhosts.conf # Local access to the Apache HTTP Server Manual
#Include conf/extra/httpd-manual.conf # Distributed authoring and versioning (WebDAV)
#Include conf/extra/httpd-dav.conf # Various default settings
#Include conf/extra/httpd-default.conf # Secure (SSL/TLS) connections
#Include conf/extra/httpd-ssl.conf
#
# Note: The following must must be present to support
# starting without SSL on platforms with no /dev/random equivalent
# but a statically compiled-in mod_ssl.
#
<IfModule ssl_module>
SSLRandomSeed startup builtin
SSLRandomSeed connect builtin
</IfModule> <VirtualHost *:80>
ProxyRequests Off
ProxyPass / balancer://testcluster/ stickysession=JSESSIONID
#ProxyPassReverse / balancer://testcluster/ #ProxyPass / http://localhost:8082/
#ProxyPassReverse / http://localhost:8082/ <Proxy balancer://testcluster>
BalancerMember http://localhost:8082/ loadfactor=1 route=server2
BalancerMember http://localhost:8080/ loadfactor=1 route=server1
</Proxy>
</VirtualHost>

tomcat配置

tomcat基本不用做什么修改.唯一要修改的就是

<Engine defaultHost="localhost" name="Catalina" jvmRoute="server1">

在server.xml里修改engine节点,加上jvmRoute=xxx

这样tomcat在加上jsessionid的时候会在结尾处加上.xxx

tomcat集群学习记录1--初识apache http server

tomcat集群学习记录1--初识apache http server

于是apache就知道请求是一定要分派给哪个tomcat了...

推荐阅读:

http://blog.itpub.net/29254281/viewspace-1070221/