server pass the tunneling technology via TP tunnelSo that they can exist in different networks.Note: Because the application server needs to restore the messages sent by LVS, the application server should also support the IP tunnel protocol. (Network options)Tun Mode features:
123456
集群节点可以跨越Internet;RIP必须是公网地址;Director仅负责处理入站请求,响应报文则由Real Server直接发往客户端;Real Server网关不能指向director;只有支持隧道功能的OS才能用于Real Server;不支持端口映射;
Eight scheduling algorithms of LVS load balancing
Java101 means Java Introductory course, because many of the introductory courses in the United States are called 101. such as the famous CS101, Introduction to Computer scienceThe link address of the original website is as follows:Category list: http://www.javaworld.com/blog/java-101/Use the following JS to extract data from the console:var C = $ (". Post-cont"), var h = c.find ("h3"), var a = H.find ("a");
Tags: duplicate data Left connection copy cross connect feature understanding show each relationshipConnection queries include merges, inner joins, outer joins, and Cross joins, and it is important to understand the characteristics of these connections if multiple table queries are involved.Only if you really understand the difference between them, can they be used correctly.1. UnionThe UNION operator is used to combine the result set of two or more SELECT statements.The UNION operator derives a
, we start from the simple structure. A project, originally a master one from the structure. 101 is the primary node, and 102 is the slave node. Migrating 102 from node to 103 due to business needs, architecture diagram I. 102 The data capacity from the node is too large to be backed up using the Mysqldump form. and research and development communication, the formation of a consistent plan. Figure one by one primary one migration from the library sche
SED usage: sed ' Command ' filename (s) displays only results without modifying the file.
1, sed ' 2,5d ' file displays files, excluding 2-5 rows, but the number of rows exceeds the actual number of files in the file does not error.
The sed '/10[1-4]/d ' file displays files, excluding rows containing 101-104.
Sed ' 2, $d ' file displays files, showing only the first row. The sed ' 2,$!d ' file displays only the other rows except the first line.
Se
'spacce ';
Emptyset (0.04 sec)
4. OR matching: used to search for one of the Two Strings |, as shown below:
[SQL]
Mysql> select roleid from v9_admin_role
-> Where roleid REGEXP '1 | 3 ';
+ -------- +
| Roleid |
+ -------- +
| 1 |
| 3 |
+ -------- +
2 rowsin set (0.00 sec)
5. match any single character. As follows:
[SQL]
Mysql> select name from v9_collection_node
-> Where name REGEXP '005-[123] ';
+ ----------------- +
| Name |
+ ----------------- +
| 10
Java101 series of articles
Java 101 indicates a Java entry-level course, because many entry-level courses in the United States are called.
The link address of the original website is as follows:
Use the following JS to extract data on the console:
Var c = $ (. post-cont); var h = c. find (h3); var a = h. find (a); // var nodes = [];! A. each (function (I, v) {// var text = v. text; var href = aa. href; // var node = {text: text, href: href, toString
---restore content starts---SQL Summary (ii) List queryConnection queries include merges, inner joins, outer joins, and Cross joins, and it is important to understand the characteristics of these connections if multiple table queries are involved.Only if you really understand the difference between them, can they be used correctly.1. UnionThe UNION operator is used to combine the result set of two or more SELECT statements.The UNION operator derives a result table by combining the other two resu
step. On the one hand, this will lead to too long articles. on the other hand, I think that as long as you know the methods, the specific method will be targeted, only depending on the degree of knowledge and the ability to obtain information;
5. For more information, see section 4.
3.1. Scenario 1: master-slave structure migration from the database
Let's start with a simple structure. Project A is originally A master-slave structure. 101 is the mast
Tags: rom int duplicate data Ali Association Pad tab Efficiency Div1. UnionThe UNION operator is used to combine the result set of two or more SELECT statements. The UNION operator derives a result table by combining the other two result tables (for example, TABLE1 and TABLE2) and eliminating any duplicate rows in the table. When all is used with the Union (that is , union ALL), duplicate rows are not eliminated. In both cases, each row of the derived table is either from TABLE1 or from TABLE2
match: To search for one of the two strings, use |, as shown below: [SQL] mysql> select roleid from v9_admin_role-> where roleid REGEXP '1 | 3 '; + -------- + | roleid | + -------- + | 1 | 3 | + -------- + 2 rowsin set (0.00 sec) 5. match any single character. [SQL] mysql> select name from v9_collection_node-> where name REGEXP '005-[123] '; + ----------------- + | name | + --------------- + | 101-02-01-005-2 | 1
Model-m:nat model-W: Weight2. Modification:-E3. Delete:-D ipvsadm-d-t|u|f service-address-r server-address3. Managing view of Cluster services1.ipvsadm-l|l [Options]OPTIONS:-N: Digital format display--stats Statistical information--rate: Statistical rate--timeout: Shows the session timeout length for TCP, Tcpinfo, and UDP-C: Number of connection clients4. Situation counter: ipvsadm-z [-t|u|f service-address] 5. Situation rule: Ipvsadm–c 6. Save the rule:1.ipvsadm-s >/path/to/somefile2.ipvsadm-s
. After the request arrives at the load balancer, the load balancer does load balancing by modifying the requested MAC address, unlike the IP load balancer, which returns the customer directly after the request has been made to access the server. Without having to go through the load balancer again.2, the second problem is the cluster scheduling algorithm problem, the common scheduling algorithm has 10 kinds.1, RR polling scheduling algorithm. As the name implies, poll the distribution request.A
that 10 years ago, some areas of mobile network local DNS were updated only one day.
The second disadvantage: the Service scheduling algorithm only supports WRR. If you have a limited range of users, there is a problem of unbalanced load. Third drawback: attack defense is very weak, each attack by a machine against.
For the lack of DNS, introduced the concept of virtual server, that is, the most front-end has a portal equipment to balance the flow of
a reverse proxy server.
Advantages: Simple deployment.
Disadvantage: Proxy server can become a bottleneck in performance, especially when uploading large files.
IP layer load Balancing. After the request reaches the load balancer, the load Balancer realizes the request forwarding by modifying the destination IP address of the request, so that the load is balanced.
Advantages: Better performance.
Disadvantage: The bandwidth of the load balancer becomes the bottleneck.
Data link layer load balanc
performance, especially when uploading large files at once.4, theIP layer load Balancing . After the request arrives at the load balancer, the load balancer implements the request by modifying the destination IP address of the request, thus enabling the load balancer to be forwarded.Advantages: Better performance.Disadvantage: The bandwidth of the load balancer becomes a bottleneck.5, Data link layer load balancing . After the request arrives at the load balancer, the load balancer does load ba
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