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                這種方式不需要修改web工程只需要對nginx下載nginx_upstream_jvm_route插件,修改tomcat和nginx配置,就能解決session問題。由于這種方式不會把session存儲起來,所以當某tomcat節點掛掉之后就會造成用戶需要重新登錄的問題。 思路:是通過對nginx里面每個參與訪問的server都打上不同的標簽值,這個值和tomcat的jvmRoute值相同。根據tomcat的特性,當server.xml配置文件中加了jvmRoute值后,會給sessionid加上jvmRoute值的后綴,根據這一特性,nginx_upstream_jvm_route對每次訪問請求中的sessionId的值,自動匹配對應的server。這樣就會使得每次都訪問到同一個tomcat,這樣就解決了訪問不同tomcat節點,session發生變化的問題。但是這種方式就會有當一直訪問的tomcat節點掛掉之后,根據負載的原理,將會訪問其它節點,就會造成session發生變化,需重新登錄的問題。 具體的實現步驟: 第一步:下載并安裝nginx_upstream_jvm_route: 進入nginx目錄,并下載和安裝nginx_upstream_jvm_route,具體代碼如下: ~~~ shell $> patch -p0 < ../nginx-upstream-jvm-route-read-only/jvm_route.patch shell $> useradd www shell $> ./configure --user=www --group=www --prefix=/usr/local//nginx --with-http_stub_status_module --with-http_ssl_module --add-module=/root/nginx-upstream-jvm-route-read-only shell $> make shell $> make install ~~~ 第二步:配置nginx 進入nginx的conf目錄用vi命令打開nginx.conf文件,對該文件進行修改: ~~~ #Nginx所用用戶和組 #user niumd niumd; #工作的子進程數量(通常等于CPU數量或者2倍于CPU) worker_processes 2; #錯誤日志存放路徑 #error_log logs/error.log; #error_log logs/error.log notice; error_log logs/error.log info; #指定pid存放文件 pid logs/nginx.pid; events { #使用網絡IO模型linux建議epoll,FreeBSD建議采用kqueue #use epoll; #允許最大連接數 worker_connections 2048; } http { include mime.types; default_type application/octet-stream; #定義日志格式 #log_format main '$remote_addr - $remote_user [$time_local] $request ' # '"$status" $body_bytes_sent "$http_referer" ' # '"$http_user_agent" "$http_x_forwarded_for"'; #access_log off; access_log logs/access.log; client_header_timeout 3m; client_body_timeout 3m; send_timeout 3m; client_header_buffer_size 1k; large_client_header_buffers 4 4k; sendfile on; tcp_nopush on; tcp_nodelay on; #keepalive_timeout 75 20; include gzip.conf; upstream tomcat { ~~~ ~~~ <span style="white-space:pre"> </span>#srun_id 值需與tomcat的jvmRoute的值對應 server 127.0.0.1:18080 srun_id=tomcat2; server 127.0.0.1:18081 srun_id=tomcat1; jvm_route $cookie_JSESSIONID|sessionid reverse; } server { listen 8081; server_name 127.0.0.1; location / { proxy_pass http://tomcat; ~~~ ~~~ #這些配置很重要 proxy_redirect off ; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header REMOTE-HOST $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto https; proxy_cookie_path / /; proxy_set_header Cookie $http_cookie; client_max_body_size 50m; client_body_buffer_size 256k; proxy_connect_timeout 30; proxy_send_timeout 30; proxy_read_timeout 60; proxy_buffer_size 256k; proxy_buffers 4 256k; proxy_busy_buffers_size 256k; proxy_temp_file_write_size 256k; proxy_next_upstream error timeout invalid_header http_500 http_503 http_404; proxy_max_temp_file_size 128m; } } } ~~~ 第三:配置tomcat server.xml 打開tomcat的server.xml, 在兩臺服務器的tomcat的配置文件中分別找到: ?<Engine name="Catalina" defaultHost="localhost" > ?分別修改為: ~~~ Tomcat01: <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1"> Tomcat02: <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2"> ~~~ 第四:向tomcat1和tomcat2中部署相同的應用 第五:運行nginx、tomcat1、tomcat2 打開之后可以在瀏覽器里面輸入:http://127.0.0.1:8081進行測試。可以通過瀏覽器的調試模式看出sessionID是固定不變的,只有當停掉當前一直訪問的tomcat,sessionID才會發生變化
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