wlc 5508

30Implementation of LVS persistent connections:There are usually three types: PCC, PPC, and firewall-based persistent connections.Pcc:PCC is used to direct all access requests from a user to the same REALSERVER within persistence_timeout (0 indicates all ports)Ipvsadm-A-t $ VIP: 0-s wlc-p 600PPCPPC is used to direct a user's access to the same service to the same REALSERVER within the timeout period.Ipvsadm-A-t $ VIP: PORT-s

. VIRTUAL_ROUTER_ID 51## # #虚拟路由标识, this identifier is a number, and the same VRRP instance uses a unique identity, that is, master and backup must be consistent under the same vrrp_instance. Priority 100##定义优先级, the higher the number, the higher the priority, and under one vrrp_instance, Master's priority must be greater than the priority of backup. Advert_int 1##设定MASTER与BACKUP负载均衡器之间同步检查的时间间隔, the unit is seconds. nopreempt Authentication {## #设定验证类型和密码. Auth_type PASS## #设置验证类型, there are ma

Realization of LVS-NAT and LVS-DR Mode Implementation of LVS in LinuxTo use LVS in linux kernels earlier than 2.4.23, you need to re-compile the kernel and install patches, later, LVS directly entered the kernel and used grep-I-C 5 ipvs/boot/config-'uname-R' to check whether ipvsadm works in the user space/ipvs works in the kernel space, the ipvsadm function defines a cluster service and REALSERVER, view cluster services-t tcp-based cluster services-u udp-based cluster services-f firewall-based

connection Overhead = Active * 256 + Inactive The RS at the backend distributes requests to the RS when there are few connections. If the overhead is the same, the RS in the top-down round-robin list is (2) WLC: weighted least connection, weighted least connection Overhead = (Active * 256 + Inactive)/weight. If the calculation result is small, it will be the selected next hop RS server. Disadvantage: When the Overhead is the same, the top-down round-

weight value.Pros: Consider the difference in server processing power3,SH original address hash : Extract the User IP, according to the hash function to derive a key, and then according to the static mapping table, the corresponding value, that is, the target server IP. The target machine is overloaded, the return is empty.4,DH target address hash : Ibid, just now extract the destination address of the IP to do the hash.Advantages: Both of the above algorithms can achieve the same user access t

) WRRMinimum connection (Least Connections) LCWeighted minimum connection (Weighted Least Connections) WLC1. Polling (Round Robin)Distribute client requests evenly to real Server2. Weighted polling (Weighted Round Robin)Set weights based on the performance of real server and then poll scheduling3. Minimum connection (Least Connections)Dynamically dispatch network requests to servers with the fewest number of established connections4. Weighted least connected

real server, you can set a higher weight, and for a less powerful real server, you can set a lower weight value, which ensures that the processing power of the server handles more traffic. The server resources are utilized fully and rationally. At the same time, the scheduler can automatically query the real server load situation, and dynamically adjust its weight value.c)LC Minimum link scheduling (Least Connections)The "least connection" scheduling algorithm dynamically dispatches network req

选项包括：rr|wrr|lc|wlc|lblc|lblcr|dh|sh|sed|nq（关于调度算法我们在上篇文章中已经详细介绍了）-r --real-server server-address 真实的服务器[Real-Server:port]。-m --masquerading 指定LVS 的工作模式为NAT 模式。Of course, Ipvsadm also includes a lot of parameters, after slowly speaking, and then the last part of this article, will give a more complete parameter summary. Finally we test:We have access to the Nginx service on the real server via the 192.168.220.100 LVS server IP in relation to the real s

): WLC weight-based minimum link5> is based on the least local link (locality-based Least Connections): LBLC scheduling algorithm is the target IP address load balancing, is mainly used in the cache cluster system . According to the target IP address of the request, the algorithm finds the most recently used server, if the server is available and not overloaded, sends the request to the server, if the server does not exist, or if the server is overloa

distribution algorithm and the load status of the Real Server. Director tracks and monitors whether each connection is in the active state (estableshed) LC: Least connection: minimum connection ----- monitor the number of active connections and inactive connections of each Real Server, and calculate its current load: Active * 256 + inactive = overhead Wlc: weighted least connection: weighted least join ------ overhead/weight. Considering the performa

address hash2.Dynamic Scheduling Method dynamic server adjustment Method (1 ). least LC connections (2 ). WLC weighted least join (3 ). SED minimum expected latency (4 ). NQ never queues scheduling method (5 ). LBLC is based on local minimum connections (6 ). LBLCR local least-connection with replication Iv. Rule SADM component definition rule format:1. define the cluster service format: (1 ). add cluster service: ipvsadm-A | E-t | u | f service-addr

/keepalived # cp. /keepalived/etc/keepalived. conf/etc/keepalived (3) copy the executable file # cp. /bin/keepalived/usr/bin (4) start/stop the service # service keepalived start # service keepalived stop2. Configure the MASTER backup and open the configuration file to modify the content. Pay special attention to the red part, the details are as follows: # cp/etc/keepalived. conf/etc/keepalive D/keepalived. conf. bak # vi/etc/keepalived. conf vrrp_instance VI_1 {state MASTER # status actual MAST

openssl*yum install libnInstall ipvsadm: rpm -ivh popt-static-1.13-7.el6.x86_64.rpm [root@lvs ipvsadm-1.26]#make make install Install keepalived: cp /usr/local/keepalived/sbin/keepalived /usr/sbin/cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/mkdir /etc/keepalivedConfigure keepalived: For more information about the parameters, see the official documentation: http://www.keepalived.org/pdf/UserGuide.pdf[root

weight value.Pros: Consider the difference in server processing power3,SH original address hash : Extract the User IP, according to the hash function to derive a key, and then according to the static mapping table, the corresponding value, that is, the target server IP. The target machine is overloaded, the return is empty.4,DH target address hash : Ibid, just now extract the destination address of the IP to do the hash.Advantages: Both of the above algorithms can achieve the same user access t

weight The server according to the weights, the number of times the server is called is proportional to the weight value.Pros: Consider the difference in server processing power3,SH original address hash : Extract the User IP, according to the hash function to derive a key, and then according to the static mapping table, the corresponding value, that is, the target server IP. The target machine is overloaded, the return is empty.4,DH target address hash : Ibid, just now extract the destination

Scheduler weight The server according to the weights, the number of times the server is called is proportional to the weight value.Pros: Consider the difference in server processing power　　　　3. SH Original address hash : Extract the User IP, according to the hash function to derive a key, and then according to the static mapping table, investigate the corresponding value, that is, the target server IP. The target machine is overloaded, the return is empty.　　　　4. DH Target Address hash : Ditto,

/default/send_redirects#注意区分网卡名字, the Amin two NICs are ENS33 and ENS37, respectively.echo 0 >/proc/sys/net/ipv4/conf/ens33/send_redirectsecho 0 >/proc/sys/net/ipv4/conf/ens37/send_redirects#director setting up a NAT firewallIptables-t nat-fIptables-t Nat-xIptables-t nat-a postrouting-s 192.168.133.0/24-j Masquerade#director设置ipvsadmIpvsadm= '/usr/sbin/ipvsadm '$IPVSADM-C$IPVSADM-A-T 192.168.142.147:80-s wlc-p 3$IPVSADM-T 192.168.142.147:80-r 192.168.

" scheduling algorithm can be used to balance the load well.4. Weighted minimum link (Weighted leastconnections) (WLC)In the case of the server performance difference in the cluster system, the scheduler uses the "Weighted least link" scheduling algorithm to optimize the load balancing performance, and the server with higher weights will bear a large proportion of active connection load. The scheduler can automatically inquire about the load of the re

respond to the client, no longer through the Director (4). Port mapping is also not supported in this model (5). Realserver only operating systems that support IP tunneling Three. LVs scheduling Method LVs Scheduling methods: 1.Fixed scheduling method for static adjustment of clothes (1). RR Polling (2). WRR Weighted Polling (3). DH Target Address Hash (4). SH Source Address Hash Method of dynamic adjustment

original address hash: Extract the User IP, according to the hash function to draw a key, and then according to the static mapping table, investigate the corresponding value, that is, target server IP. If the target machine is overloaded, it returns empty. 4, DH target address hash: Ditto, only now extract is the destination address IP to do the hash. Advantages: Both of the above algorithms can achieve the same user access to the same server. 5, LC Minimum connection. Prioritize requests to se