Jan 1, 2018 - CentOS Linux 7 Kernel Update 3.10.0-123.4.4 Released. Posted by Curtis K in Administration, CentOS 7, News. Install SNMP Service/Daemon. How to Install or Upgrade to Kernel 4.17 in CentOS 7 Although some people use the word Linux to represent the operating system as a whole, it is important to note that, strictly speaking, Linux is only the kernel.

Inno setup bde installer seattle. Install Required Packages for Kernel Compilation To get started we’ll need to make sure all repositories are up to date and that te system its self is up to date as well, then we’ll install the development tools that we’ll need to compile the kernel, and we should also install the nurses library using the following yum command. # yum update # yum install -y ncurses-devel make gcc bc bison flex elfutils-libelf-devel openssl-devel grub2 Compile and Install Kernel in CentOS 7 Let’s download the latest Kernel 4.17 sources using wget command under /usr/src/ directory or you can also download the latest kernel by going to kernel.org # cd /usr/src/ # wget Extract the archived files and change directories using following commands. # tar -xvf linux-4.17.11.tar.xz # cd linux-4.17.11/ Configure the Kernel in CentOS 7 The Kernel must be correctly configured with the following required configuration options within the CentOS 7environment.

CONFIG_KVM_GUEST=y CONFIG_VIRTIO_PCI=y CONFIG_VIRTIO_PCI_LEGACY=y CONFIG_BLK_DEV_SD CONFIG_SCSI_VIRTIO=y CONFIG_VIRTIO_NET=y CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y It is important that you copy the running kernel configuration (.config) from the /boot directory to new kernel linux-4.17.11 directory. # cp -v /boot/config-3.10.0-693.5.2.el7.x86_64 /usr/src/linux-4.17.11/.config We’re now ready to run the make menuconfig command to configure the Linux kernel. Once you execute the below command a pop up window will appear with all the menus.

This is where you can enable or disable kernel features, however if you unfamiliar with these menus, it’s best if you just hit ESC key to exit and continue as is. # cd /usr/src/linux-4.17.11/ # make menuconfig Once your kernel configuration options are set, click on Save to save the configuration interface and exit from the menu. Save Kernel Configuration Compile the Kernel in CentOS 7 Before starting kernel compilation, make sure your system has more than 25GB of free space on the file system. To confirm, you can check the file system free space using df command as shown. # df -h Now we can compile and install the kernel and modules using following commands ( it may take several hours depending on the available resources).

The compilation process place files under /boot directory and also make a new kernel entry in your grub.conf file. # make bzImage # make modules # make # make install # make modules_install Once the compilation completes, reboot the system and verify newly installed Kernel.

After installing sendmail* and running the following commands: [root@sendmail ~]# yum install sendmail* [root@sendmail mail]# yum install dovecot [root@sendmail mail]# cd /etc/mail/ [root@sendmail mail]# vi local-host-names # local-host-names - include all aliases for your machine here. Example.com [root@sendmail mail]# vi /etc/dovecot.conf protocols = imap pop3 //uncomment [root@sendmail mail]# m4 sendmail.mc > sendmail.cf [root@sendmail mail]# make [root@sendmail mail]# /etc/init.d/sendmail start [root@sendmail mail]# /etc/init.d/saslauthd start [root@sendmail mail]# /etc/init.d/dovecot start [root@sendmail mail]# chkconfig sendmail on [root@sendmail mail]# chkconfig dovecot on [root@sendmail mail]# chkconfig saslauthd on I still had the same issue. I checked my /var/log/maillog and saw an error: My unqualified host name (domain) unknown; sleeping for retry After more searching, I changed /etc/hosts from: 127.0.0.1 localhost localhost.localdomain domain ip.ip.ip.ip domain localhost to: 127.0.0.1 localhost.localdomain localhost domain ip.ip.ip.ip localhost domain and now the mail function is now working fine. I know this has been answered but I had a similiar problem.

In case anyone else. /var/log/maillog showed me a Postfix permission issue.