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With the popularity of Linux in Open source system, its application in large and medium-sized enterprises is becoming more and more popular, many enterprise application services are built on it, such as Web services, database services, cluster services and so on. Therefore, the security of Linux has become an enterprise to build a security application of a foundation, is the most important, how to protect i
new cluster systems use the blade architecture. Due to the use of blade server can greatly reduce the number of external cables required, can greatly reduce the trouble caused by cable connection failure, improve system reliability the server is configured or used differently, so there is a big difference in the choice of the operating system, so why Span style= "FONT-FAMILY:CALIBRI;" >PC on operating s
Linux Server Load balancer cluster system solution-Linux Enterprise Application-Linux server application information. For details, refer to the following section. 1. Introduction to Linux virtual servers
Article Title: how to configure the e-mail server in Linux ?. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. With the development of the Internet, e-mail has rapidly grown into a m
A few years ago, only Sendmail was available for free mail servers in Linux. However, due to the Sendmail defect, some developers have developed several other mail server software. Currently, the free email server running in Linux, or the MTA (Mail Transfer Agent), has several options: Sendmail, Qmail, Postfix, exim, a
1. Introduction to Linux virtual servers Linux Virtual Server (LVS) is a high-availability Server Load balancer cluster system. The system can provide Load Capacity proportional to the number and performance of server nodes, effectively improving service throughput, reliabil
I. Introduction Nginx is a very lightweight HTTP server written by Russians. Nginx, pronounced "engine X", is a high-performance HTTP and reverse proxy server, and it is also an IMAP / POP3 / SMTP proxy server. Nginx was developed by Russian Igor Sysoev for the second most visited site in Russia, Rambler.ru, which has
DHCP server configurationDHCP service is only used in C/s architecture, so a server is required to provide a DHCP serverNote: The system of this DHCP experiment is CentOS 6.6Linxu DHCP Service installation:Yum Install DHCPThe DHCP service can be installed with the above commandAfter the installation is complete, the DHCP service script is DHCPDService script:/ETC/RC.D/INIT.D dhcp,67/udp:
1, why can not configure the mail server for open relay? If your system administrator sets your mail server to open relay, will cause some spammers to use your mail server as a relay station for forwarding spam messages, which wi
1, why can not configure the mail server for open relay? If your system administrator sets your mail server to open relay, will cause some spammers to use your mail server as a relay station for forwarding spam messages, which wil
$server _name;wget http://www.cpan.org/authors/id/M/MH/MHARNISCH/Unix-Syslog-1.1.tar.gzTar XF unix-syslog-1.1.tar.gzCD unix-syslog-1.1Perl makefile.plMake make installInstall the certificate to postfix and configure the PostfixVi/etc/postfix/main.cfSmtpd_use_tls = yesSmtpd_tls_key_file =/etc/postfix/mailkey.pemSmtpd_tls_cert_file =/etc/postfix/mail_signed_cert.pemSmtpd_tls_cafile =/etc/postfix/cacert.pemSmtp_use_tls = yesSmtp_tls_note_starttls_offer
In Linux, configure and install the Domino server-Linux Enterprise Application-Linux server application information. For more information, see. Lotus Domino/Notes provides Linux-based versions starting with R5.0.0 as part of IBM's
Article Title: Secure and Efficient Web mail server in Linux. Linux is a technology channel of the IT lab in China. Includes desktop applications, Linux system management, kernel research, embedded systems, open source, and other basic classification services or technologies that use web browsers to send and receive em
maintenance Operating system is the Software foundation of server running, its importance is self-evident. Most server operating systems use Windows 2003 or Windows 2008Server as the operating system, which is easy to maintain. Open Event Viewer in Windows NT or Windows 2003 server to see if there are any unusually unusual records in the system log, security l
Unix, each different network service had a service program running in the background. Later versions used a uniform/etc/inetd server program. Inetd is short for Internetdaemon. It monitors multiple network ports at the same time. Once it receives connection information from the outside, it executes the corresponding TCP or UDP network service. Due to the unified command of inetd, Most TCP or UDP services in Linux
Most of the time, Linux is a configuration platform we need. We implement it in a virtual machine environment. Generally, when a virtual machine is opened, it will slow down. We only use one 2003 Server for customer service machine verification, during verification, you only need to set the 2003 Nic channel. In this experiment, the Red Hat Enterprise Edition 4 is used. The following describes how to impleme
identity source using ${user} User Login System ------------------------------------------------------------- Systeminformation Host name: $HOSTNAME kernel version: $Kernel _version system Elapsed time: $Up _runtime Last restart time: $Up _lastime Current number of users logged in: $Login _user Last Login user: $Last _user-------------------------------------------------------- ----- "}; head>/tmp/.loginmailtitle= "host: ' echo $HOSTNAME ' login prompt (' date ' +%f%T "')" body= ' Cat/tmp/
= "0"The following settings are the ports that are allowed on the server. In csf.conf, navigate to the following section and modify the ports as needed:# Allow inbound TCP portstcp_in = "20,21,25,53,80,110,143,443,465,587,993,995,16543"# Allow outbound TCP portsTcp_out = "20,21,22,25,53,80,110,113,443,587,993,995,16543"# Allow inbound UDP portsudp_in = "20,21,53"# Allow outbound UDP ports# to allow traceroute requests to be made, add 33,434:33,5
"testing" to 0.testing = "0"The following settings are the ports that are allowed on the server. In csf.conf, navigate to the following section and modify the ports as needed:# Allow inbound TCP portstcp_in = "20,21,25,53,80,110,143,443,465,587,993,995,16543"# Allow outbound TCP portsTcp_out = "20,21,22,25,53,80,110,113,443,587,993,995,16543"# Allow inbound UDP portsudp_in = "20,21,53"# Allow outbound UDP ports# to allow traceroute requests to b
As a DHCP server, it can be configured in many systems and methods. We implement it in a virtual machine environment. Generally, when a virtual machine is opened, it will slow down. We only use one 2003 Server for customer service machine verification, during verification, you only need to set the 2003 Nic channel. In this experiment, the Red Hat Enterprise Edition 4 is used. The following describes how to
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