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Public network publishing can not be separated from the edge server, like the front end, edge servers also need a highly available architectureCan be implemented through the hardware load balancer and DNS polling, we use DNS polling implementation, but the external network will need two public address, as a demonstration I will publish aThe deployment content is
implement simple load balancing.However, it is obvious that this round robin is not very uniform, and the pressure on one server is always high. The other is relatively close, but after removing the high pressure from the dns list, the next instance in the list is under high pressure,Then add the previous one back to the dns list, and the pressure will go back t
0 Preface
Starting from this article, the author will introduce how to build an ArcGIS 10.1 for server cluster in a Linux environment. Because the cluster involves Server Load balancer processing and requests need to be distributed among different machines, domain name resolution is required. In addition, machines in the cluster need to share the site configuration file and service configuration information
can be used for anti-spam verification.In fact, each DI server is only responsible for managing one or several domains within the domain of the vitality of the name and IP address of the corresponding relationship, these specific DNS city or P address segment called "20 zone, according to address the direction of the bridge is differentDNS zones are appropriately divided into forward zones (the parsing rec
primary DNS server and the DNS server. The primary DNS server authorizes a specific domain name and has a rewritable DNS zone file that can be updated when needed. Receives a read-only
A DNS server, or name server, is used to resolve an IP address to a hostname or vice versa.You can set up four different types of DNS servers:
Amaster DNS Server for your dom
DNS server.
Back to the top
More InformationTo stop the DNS cache, run any of the following commands:
•
net stop DnsCacheOr
•
SC Server name Stop DnsCache
To permanently disable DNS caching in Windows, use t
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DNS server is responsible for the work of domain name resolution, its importance is self-evident. If there is a problem with the DNS server in the network or if the information data is lost, the server will not be able to complete the domain name parsing work. Therefore, you
{none;};};Step Two: Modify/etc/named/clients.acl (preferably all clients.acl together, including Var directory and slave server)Add your IP from DNS server, such as:650) this.width=650; "title=" 2.png "alt=" wkiom1xjx_sgapdhaacjavcelm4994.jpg "src=" http://s3.51cto.com/wyfs02/ M01/71/3a/wkiom1xjx_sgapdhaacjavcelm4994.jpg "/> Step Three: Modify the/etc/named/name
It is most convenient to set up the Internet in the virtual machine, because there is no need to manually set up the Internet, but Nat's Internet mode by default is DHCP dynamically assigned IP, which means that every time you restart the virtual machine has a different IP address, which is not a problem for the general user. But if you have special use of the machine, such as the
. GetInstances ();ManagementBaseObject inPar = null;ManagementBaseObject outPar = null;Foreach (ManagementObject mo in moc){// Skip this step if no network device with IP settings EnabledIf (! (Bool) mo ["IPEnabled"])Continue;// Set the IP address and maskIf (ip! = Null submask! = Null){InPar = mo. GetMethodParameters ("EnableStatic ");InPar ["IPAddress"] = ip;InPar ["SubnetMask"] = submask;OutPar = mo. InvokeMethod ("EnableStatic", inPar, null );}//
community) to an IP address such as 190.96.134.163. If there is no DNS, you must use a number as hard to remember as 190.96.134.163. The computer that provides the DNS service is the DNS server.There are three types of DNS servers: Cache-only server, Primary Name
. Therefore, it is necessary to refresh the data. Otherwise, the data is cached once. After the Domain Name Record is changed. ISP will never find a new record. After understanding this principle, you will understand why records that have not been registered and become effective soon. The modification takes effect very slowly. This is because of the cache. However, if no cache is available, the access efficiency will be very low, because any time you enter www.askbaidu.com, you have to run to NS
order to be easy to remember, the domain name is used instead of the IP address to identify the site address. The resolution of the domain name is done by the DNS server.What is a record?A (address) record is the IP address record used to specify the hostname (or domain name). Users can point the Web server under the domain name to their own Web server. You can
connection, right-click it, select Properties, and select the Internet Protocol version 4 entry in the pop-up window list. Click the "Properties" button below and set it to 127.0.0.1 in the "Preferred DNS server" option in the pop-up window (Figure 3). All future domain resolution requests issued by the system will be processed by the tool and sent to the
DNS (domain Name System), the Internet as the domain name andIP Addressone of the mutual mappingsDistributed databaseTo make it easier for users to accessInternet, instead of remembering the number of IP strings that can be read directly by the machine. ThroughHostname, the process of eventually getting the IP address for that hostname is called Domain name resolution (or hostname resolution). The DNS proto
automatically obtains the IP address through DHCP.
Over time, client host records in a region may become obsolete, and scavenging deletes these records. Deleting records can improve the DNS server and regional transmission performance, and ensure that host records are not old record conflicts.
You can configure scavenging through the attribute of a region. Open the DNS
.(4) record the cache and return the path to the user.Note: In the system, we can track the path through the dig command.Workflow:2. Build a DNS serverToday, we are going to build a DNS server by ourselves. Such requirements are still available within the company.First, find the packages that install dns:Install the dns
1. Domain name resolution: domain name-->DNS server-->IP address;2. DNS domain name is also called the DNS namespace, it is managed by hierarchical tree structure;3. DNS Domain name structure: root domain--top level domain name (domain name), level two domain name, level thr
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