Nan Xiao's Blog

A system software / performance engineer's home

Month: September 2015 (Page 1 of 2)

Install git-email on RHEL 7.0

The RHEL 7.0 ISO doesn’t provide git-email rpm package by default. Because the git rpm provided by ISO file isgit-1.8.3.1-4.el7.x86_64.rpm, you should download the same version here, and install it:

[root@linux ~]# rpm -ivh git-email-1.8.3.1-4.el7.noarch.rpm
warning: git-email-1.8.3.1-4.el7.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
error: Failed dependencies:
        perl(Authen::SASL) is needed by git-email-1.8.3.1-4.el7.noarch
        perl(Net::SMTP::SSL) is needed by git-email-1.8.3.1-4.el7.noarch

From the error message, we know also need to use yum to install perl-Net-SMTP-SSL and perl-Authen-SASL packages:

[root@linux ~]#yum install perl-Net-SMTP-SSL
[root@linux ~]#yum install perl-Authen-SASL

Done!

 

Why does chainloader complain “invalid signature”?

My computer has multiple harddisks and every disk has multiple partitions. I install the SLES (Suse Linux Enterprise Server) on the 5thpartition of the 2nd harddisk, but find it can’t boot:

grub> set root="(hd1,msdos5)"
grub> chainloader +1
error: invalid signature.

After checking installation steps, I find by default, the SLES can’t install bootcode on the partition:

1

Click the install option in the above picture, then it will install the bootcode :

2

then the boot process is OK!

 

Install ktap on RHEL

My RHEL is 7.0, the minimal installation. Build ktap, it outputs the following error:

[root@redhat ktap-master]# make
    CHK libelf
Makefile:108: No libelf found, disables symbol resolving, please install elfutils-libelf-devel/libelf-dev
make -C /lib/modules/3.10.0-123.el7.x86_64/build M=/root/ktap-master modules
make: *** /lib/modules/3.10.0-123.el7.x86_64/build: No such file or directory.  Stop.
make: *** [mod] Error 2

(1)

To fix “No libelf found, disables ...” error, you need to install elfutils-libelf-devel package:

[root@redhat ktap-master]# yum install elfutils-libelf-devel
Loaded plugins: product-id, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Resolving Dependencies
--> Running transaction check
---> Package elfutils-libelf-devel.x86_64 0:0.158-3.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved
......

(2)

To fix “*** /lib/modules/3.10.0-123.el7.x86_64/build: No such file or directory.” error, you need to install kernel-devel package:

[root@redhat ktap-master]# yum install kernel-devel
Loaded plugins: product-id, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Resolving Dependencies
--> Running transaction check
---> Package kernel-devel.x86_64 0:3.10.0-123.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

Then make is OK!

 

How to install git on SUSE

On SUSE, when you want to install git, execute “zypper in git“:

nanxiao:~ # zypper in git
Loading repository data...
Reading installed packages...
'git' not found in package names. Trying capabilities.
No provider of 'git' found.
Resolving package dependencies...

Nothing to do.

You should use “zypper in git-core“:

nanxiao:~ # zypper in git-core
Loading repository data...
Reading installed packages...
Resolving package dependencies...

The following 2 NEW packages are going to be installed:
  git-core perl-Error

2 new packages to install.
Overall download size: 3.2 MiB. Already cached: 0 B. After the operation, additional 19.5 MiB will be used.
......

Enjoy git now:

nanxiao:~ # git
usage: git [--version] [--help] [-C <path>] [-c name=value]
           [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]
           [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]
           [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]
           <command> [<args>]

The most commonly used git commands are:
......

 

Select disk when installing SLES 12

When installing SLES(SUSE Linux Enterprise Server) 12, I find the installation may corrupt other OSs. For example, I have two disks: the first(/dev/sda) has been installed the Fedora, and I want to install SLES on disk 2(/dev/sdb) :

2

 

If no attention, the SLES may occupy both disks:

5

The solutions is select “Create Partition Setup...“: 6

Select the second disk:

3

Then “Next“, “Next“…. The SLES can do the partition automatically:

4

You can install SLES now.

 

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