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length and prefix dual groups. Notification Message: This message is sent after an error is detected. After the message is sent, the BGP connection is closed immediately. 650) this. width = 650; "border =" 0 "alt =" "src =" http://www.bkjia.com/uploads/allimg/131227/02324214B-8.jpg "/> BGP state machine The first router to start the BGP process (active) * Oct 2 21:43:44. 411: BGP: 12.0.0.1 open active, local address 12.0.0.2 * Oct 2 21:43:

Recently, an oracle10gRAC dual-node experimental platform was set up in vmware, And the oracleRAC was upgraded from 10.2.0.1 to 10.2.0.5. Later, it was found that Recently, an oracle10g RAC dual-node experimental platform was built in vmware and oracle RAC was upgraded from 10.2.0.1 to 10.2.0.5. Later, it was found that 1) Background: Recently, an Oracle10g RAC dual-node experimental platform was built in vmware and oracle RAC was upgraded from 10.2.0.1 to 10.2.0.5. Later, it was found that

; RemoteAddress:Port Forward Weight ActiveConn InActConnTCP 192.168.150.173:3306 wrr persistent 60-> 192.168.150.171:3306 Local 3 0 0TCP 192.168.150.174:3306 wrr persistent 60-> 192.168.150.172:3306 Route 3 0 0-> 192.168.150.171:3306 Local 1 0 0 Status of B after A fault Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConnTCP 192.168.150.173:3306

: 192.168.150.173 (write)R-VIP: 192.168.150.174 (responsible for reading)Client: any. You only need to access the above three IP addresses.3.2 architecture DiagramThe architecture diagram is as follows:3.3 design principles (Exceptions)1. server A and server B use binlog to synchronize data through the mysql slave process.2. enable two virtual IP addresses through keepalived: W-VIP/R-VIP, one responsible for writing, one responsible for reading, to achieve read/write separation.3. When both A an

the same time) You can also modify the source IP address (cip --> dip) and target IP address (vip --> rip) of the Request Message for forwarding; Note: The first three types are standard, and the fourth type is post-added. The kernel may not be supported by default, and you need to compile the kernel automatically. (1) VIP is a public IP address; RIP and DIP are private IP addresses, which may not be in the same IP network, but must communicate with each other through routes; (2) The source IP

. -----Load Balancer ConfigurationConfiguring the alias Card Ifconfig eth0:1 192.168.1.181 netmask 255.255.255.0 up # ④ manually perform configuration add LVS server and increase two RS Ipvsadm-cIpvsadm--set 30 5 60Ipvsadm-a-T 192.168.1.181:80-s wrr-p 20Ipvsadm-a-T 192.168.1.181:80-r 192.168.1.178:80-g-W 1Ipvsadm-a-T 192.168.1.181:80-r 192.168.1.179:80-g-W 1 [Delete method]

situation of each server, dynamically select a real server to respond to user requests, then the dynamic selection is how to implement, in fact, we are here to say the load scheduling algorithm, according to different network service requirements and server configuration, Ipvs implements the following eight kinds of load scheduling algorithms, here we detail the most commonly used four scheduling algorithms, the remaining four scheduling algorithms please refer to other information.A)RR Polling

theLetter3, each internal RS node gateway address, must be configured as the scheduler lb private LAN within the physical network card address。。。Omitted####################### #IPVS调度器实现了如下十种负载调度算法: LVs scheduling algorithm10 Kinds of scheduling algorithmsFixed scheduling algorithm: Rr,wrr,dh,shDynamic scheduling algorithm: Wlc,lc,lblc,lblcr,sed,nq.Three most commonly used RR WRR WLC10 scheduling algorithm

192.168.200.1 smtp_connect_timeout 30 router_id LVS_DEVEL}vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.200.10 }}virtual_server 192.168.200.10 80 { delay_loop 6 lb_algo wrr lb_kind DR net_mask 255.255.255.0 protocol TCP real_server 192.168.200.138 80 {

Kerugaki-Blog Parkhttp://www.cnblogs.com/kailugaji/Software that needs to be prepared:Jdk,eclipse,exe4j,inno Setup CompilerFirst, the Java source program--Personal income tax:Package Math;import Javax.swing.JOptionPane;Kerugaki Http://www.cnblogs.com/kailugaji/public class Wrrtax {public static void main (string args[]) {string Mone Y Enter your income double x, y; Double tax=0; Joptionpane.showmessagedialog (NULL, "personal income tax calculator \ n" + "Producer:" + "Kerugaki \ n" + "http:/

hosts:1. mysql installation (slightly)2. keepalived InstallationYum Install keepalived2. LVS InstallationYum Install IpvsadmFive, configuration1. Configure master-slave replication for MySQL (slightly)2. Configure keepalivedThe configuration on MasterVi/etc/keepalived/keepalived.conf[Plain]View Plaincopy ! Configuration File for Keepalived Global_defs { router_id mysql-ha } Vrrp_instance Vi_1 { State BACKUP Interface eth1 VIRTUAL_ROUTER_ID 90 Priority 100 Advert_int

650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M02/44/00/wKiom1PfBUiAsdXPAAGJejU3fgs656.jpg "style =" float: none; "Title =" 1.png" alt = "wkiom1pfbuiasdxpaagjeju3fgs656.jpg"/> 650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M01/44/01/wKioL1PfBmHCmtonAAI-6ToYaIo849.jpg "style =" float: none; "Title =" 2.png" alt = "wKioL1PfBmHCmtonAAI-6ToYaIo849.jpg"/> 650) This. width = 650; "src ="

1) Whether MySQL is installed in CHEKC CentOS[Email protected] mysql]# Rpm-qa | grep mariadbMariadb-libs-5.5.52-1.el7.x86_642) uninstallation process[Email protected] mysql]# rpm-e--nodeps mariadb-libs-5.5.52-1.el7.x86_643) installation processThe installation sequence is as follows:RPM-IVH mysql-community-common-5.7.17-1.el7.x86_64.rpmRPM-IVH mysql-community-libs-5.7.17-1.el7.x86_64.rpmRPM-IVH mysql-community-client-5.7.17-1.el7.x86_64.rpmRPM-IVH mysql-community-devel-5.7.17-1.el7.x86_64.rpmRPM

:1500 metric:1Interrupt:9 Base address:0xc000[Root@lvs-gs001 ipvsadm-1.24]# IpvsadmIP Virtual Server version 1.2.1 (size=4096)Prot Localaddress:port Scheduler Flags-> remoteaddress:port Forward Weight activeconn inactconn[root@lvs-gs001 ipvsadm-1.24]# Ipvsadm--help[root@lvs-gs001 ipvsadm-1.24]# ipvsadm--set 5 #--set TCP tcpfin UDP set connection timeout values[root@lvs-gs001 ipvsadm-1.24]# ipvsadm-a-t 172.28.95.245:80-s wrr-p add virtual service with

Scheduler Flags -> remoteaddress:port nbsp forward Weight activeconn inactconn TCP 10.1.1.166:www RR -> 10.1.1.164:www nbs P route 1 nbsp 483 -> 10.1 .1.163:www route 1 483 N bsp; IP VirTual Server version 1.2.1 (size=4096) prot localaddress:port Scheduler Flags -> remoteaddress:port forward Weight activeconn inactconn TCP 10.1.1.166:WWW R R -> 10.1.1.164:www route 1 0 5 -> 10.1.1.163:www nbsp ; route 1 0 nbs

Architecture diagramThe installation steps are omitted.158.140 keepalived.conf! Configuration File for keepalivedglobal_defs {#全局标识模块 Notification_email {#定义邮件通知 [emailprotected] #目标邮箱} notification_email_from [emailprotected] #发送邮箱 Smtp_ser ver 127.0.0.1 #发送邮箱的smtp服务器 smtp_connect_timeout #smtp服务器连接超时时间 router_id lvs_2}vrrp_instance vi_1 { State BACKUP #本实例启动状态: Master/backup interface eth0 #监控的网络接口 Virtual_rou ter_id #vrrp实例 (same as a group master standby server Settings) Priority #优先级

identify the layer-4 Information of data packets and rewrite the information based on the QoS policy set on the vswitch. It is worth noting that, instead of a product that supports DSCP, data packets can be identified and overwritten Based on layer-4 (layer-4) information. This is a coincidence. It should be said that it supports identification of Layer 3/4 information, and QoS is truly meaningful, because there are few terminals and software that support IEEE 802.1p in actual applications. Man

{?? # Linux virtual server (LVS) Configuration Delay_loop 2 ??? ? # Check the real_server status every 2 seconds Lb_algo wrr ????? # LVS scheduling algorithm, rr | wrr | lc | wlc | lblc | sh | dh Lb_kind DR ???? ? # LVS cluster mode, NAT | DR | TUN Persistence_timeout 60 ?? ? # Session persistence time Protocol TCP ??? # Whether the protocol used is TCP or UDP Real_server 192.168.187.129 3306 { Weig

# Virtual route number, master and subordinate to always priority 100 # priority, the larger the number, the higher the priority to get processing requests ADV Ert_int 1 # Check interval, default to 1s (vrrp multicast cycle seconds) authentication {Auth_type Pass Auth_pass 1111} virtual_ipaddress {192.168.1.200 # defines the virtual IP (VIP), can be set more, each line A}} # defines the VIP of the externally provided LVS and port Virtual_server 192 .168.1.200 8080 {delay_loop 6 #

；#______________________________________________________________________________[[emailprotected] ~]# ipvsadm -A -t 192.168.1.200:80 -s rr#修改[[emailprotected] ~]# ipvsadm -E -t 192.168.1.200:80 -s wrr#删除[[emailprotected] ~]# ipvsadm -D -t 192.168.1.200:803. Node Management#增改#ipvsadm -a|e -t|u|f service-address -r server-address [-g|i|m] [-w weight]#lvs类型： #-g: gateway, dr类型 #-i: ipip, tun类型 #-m: masquerade, nat类型# -w weight：权重；#_____________