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Showing posts with label Fedora 27. Show all posts
Showing posts with label Fedora 27. Show all posts

Sunday, April 1, 2018

Fedora 27 : Fix your distro with systemctl .

This is a simple tutorial about systemctl tool and how to fix one simple error show by status. The help of this cmmand can be found with:
# man systemctl
Let's see how we can see this errors and how this working. First let's see the status for systemctl command (:
# systemctl status
The output is this:
    ● laptop
    State: degraded
     Jobs: 0 queued
   Failed: 1 units
    Since: Sun 2018-04-01 10:44:37 EEST; 58min ago
   CGroup: /
           ├─user.slice
           │ └─user-1000.slice
           │   ├─user@1000.service
           │   │ └─init.scope
           │   │   ├─929 /usr/lib/systemd/systemd --user
           │   │   └─931 (sd-pam)
           │   └─session-1.scope
           │     ├─ 748 login -- mythcat
           │     ├─ 936 -bash
           │     ├─ 982 sudo su
           │     ├─ 986 su
           │     ├─ 987 bash
           │     └─9879 systemctl status
           ├─init.scope
           │ └─1 /usr/lib/systemd/systemd --switched-root --system --deserialize 24
           └─system.slice
             ├─irqbalance.service
             │ └─655 /usr/sbin/irqbalance --foreground
             ├─lvm2-lvmetad.service
             │ └─578 /usr/sbin/lvmetad -f -t 3600
             ├─firewalld.service
             │ └─698 /usr/bin/python3 -Es /usr/sbin/firewalld --nofork --nopid
 ...
Detect the problem from list all failed units:
# systemctl list-units --state=failed
I find the rngd module is the problem. To fix this issue just use this commands:
# systemctl daemon-reload
# systemctl status rngd 
# systemctl stop rngd
# systemctl disable rngd
# systemctl enable rngd
# systemctl start rngd
The next step is reboot and check again if systemctl come with errors.

Saturday, March 31, 2018

News: Yahoo hit QupZilla.

Like most, you already know as an XFCE environment installation comes with QupZilla web browser.
The QupZilla web browser is a lightweight multiplatform web browser written in Qt Framework and using its web rendering engine QtWebEngine.
If you using Fedora 28 you can get the Falkon web browser.
The Wikipedia tells us about Falkon browser "(formerly QupZilla[3]) is a free and open-source web browser, intended for general users. Falkon is licensed under GPLv3."
The Falkon browser working well with Yahoo.

About QupZilla web browser.

I used this web browser with Fedora 27 distro and then I tested with new Fedora 28.
Same problem from both distros with the Yahoo mail and the QupZilla web browser.
After authenticating when you access the mail button, a message that redirects us to use other browsers.
Is it okay or bad?
Most users would like to have no such issues.

Thursday, March 29, 2018

Fedora 27 : Tips and tricks with hugo framework .

he most important fact in learning development is knowing the information flow and how to drain it knowing the elements and stages of information processing of the content.
That's why I wrote this article succinctly to show you how simple basics of exemplification can correctly complete and help the user to modify and create content.
I will show you how to follow steps into hugo framework and website development with hugo.
You need to read the basic of hugo terms from documentation if you want to learn all about hugo or take some helpful information.
First use --verbose flag gives extra information that will be helpful when we debug or build your hogo website.
You need to know your hugo version because is the old versions has bad issues, check it with:
$ hugo version
The next command is to see and debug your work:
$ hugo --verbose 
How hugo framework works when you start for the first time with hugo development.
Now, the first place that Hugo will look for rules and files is in the layouts/ directory so it will always find the skin.
If you start with hugo then you can change the default.
This files name skins are the files responsible for the look and feel of your site.
You have two ways to create a skin:
  • create it in the layouts/ directory;
  • create it in a sub-directory of the themes/ directory.
A skin in layouts/ folder can’t be customized without updating the templates and static files that it is built from.
The skin created in themes/ folder , can be and that makes it easier for other people to use it.
In my example tutorial , I add this text to themes/test_themes_001/layouts/index.html.
The result of running hugo server command will rput this text on your browser at 127.0.0.1:13131, see command:
$ hugo server --buildDrafts
The hugo command come with many features like :
  • --buildDrafts this include content marked as draft ( see files with draft:true from .md file);
  • --ignoreCache this ignores the cache directory if you use it;
Using --verbose let you to see your errors.
For example a bad template or configuration can come with this error:
 ...Unable to locate layout for "taxonomyTerm" ...
This show you what term created by you is not on your hugo development area.
I make just few changes to show you how the hugo working. First I create the website named hugo_website_001. I used hugo command to add some pages first_test.md and new.md and a theme named test_theme_001, see:
$ hugo new site hugo_website_001
$ cd hugo_website_001
$ hugo new theme test_theme_001
$ hugo new first_test.md
$ hugo new new.md
$ tree 
.
├── archetypes
│   └── default.md
├── config.toml
├── content
│   ├── first_test.md
│   └── new.md
├── data
├── fpaste_hugo.txt
├── layouts
├── public
│   ├── categories
│   │   └── index.xml
│   ├── css
│   ├── index.html
│   ├── index.xml
│   ├── js
│   ├── sitemap.xml
│   └── tags
│       └── index.xml
├── static
└── themes
    └── test_theme_001
        ├── archetypes
        │   └── default.md
        ├── layouts
        │   ├── 404.html
        │   ├── _default
        │   │   ├── list.html
        │   │   └── single.html
        │   ├── index.html
        │   ├── index.html.save
        │   └── partials
        │       ├── footer.html
        │       └── header.html
        ├── LICENSE.md
        ├── static
        │   ├── css
        │   └── js
        └── theme.toml

19 directories, 20 files
$ 
Let's see files for settings - the toml file type. First is the config.toml file:
baseURL = "http://localhost.com"
languageCode = "en-us"
title = "My New Hugo Site"
theme = "test_theme_001"
contentdir ="content"
publishdir = "public"
The next file is the theme.toml .

# theme.toml template for a Hugo theme
# See https://github.com/gohugoio/hugoThemes#themetoml for an example

name = "Test_theme_001"
license = "MIT"
licenselink = "https://github.com/yourname/yourtheme/blob/master/LICENSE.md"
description = "first theme with hugo"
homepage = "http://example.com/"
tags = ["tags","categories"]
features = []
min_version = "0.31"

[author]
  name = "catafest"
  homepage = "free-tutorials.org"

# If porting an existing theme
[original]
  name = ""
  homepage = ""
  repo = ""
I will show a minimal example to understand the changes you need to make to run well with hugo framework and the my custom theme.
I show next how this changes into files is show by hugo on browser.
The basic file load is the index.html from themes/test_theme_001/layouts folder with tag h2 and text Some text !, see:

Some text !


{{ partial "header.html" . }}
This file load another file from partials folder and is named header.html with tag p and this text:
This is a custom header
Let's run the hugo server :
hugo server --theme=test_theme_001 --buildDrafts --ignoreCache --disableFastRender
This is result is this:

Saturday, March 24, 2018

Fedora 27 : Testing the hugo web framework .

The development team come with this shot info: The world’s fastest framework for building websites.
I don't know if is the fastest framework but I'm sure is the fastest process to install and make settings using Fedora distro.
First you need to know this framework works with golang programming language.
Let's start testing this framework with the first step install the golang on the system.
$ sudo dnf install golang
$ mkdir -p $HOME/go
$ echo 'export GOPATH=$HOME/go' >> $HOME/.bashrc
$ source $HOME/.bashrc
$ go env GOPATH
/home/mythcat/go
Now you will have a go folder into home folder. Let's install the hugo framework.
$ cd  go
$ hugo new site hugo_website_001
$ cd hugo_website_001
$ tree
The result will the this:

The next step is the testing the hugo server with some commands:
$ hugo version
$ hugo --verbose
$ hugo server --verbose
$ hugo server
This will start the server and you can be see it at 127.0.0.1:1313. This is a bind address of the default hugo server and you need to set like any website. The file named config.toml in your site directory contains the global configuration for your Hugo site. This settings will make our website to run well. We can use one theme from a list of themes using git tool, see themes gohugo.io. If you get a theme named theme_001 you need to add it into config.toml file like:
theme = theme_001
The next step is to create some content and we can start with draft files. The draft file named first_test.md can be created with this command into hugo_website_001 folder. This will create the file into content folder.
$ hugo new first_test.md
The draf files can be render just if you use D option:
$ hugo server -D
If you don't have install or set a theme then you cannot see the draft or any content web pages. You can create a new theme (example: test_theme_001) and deal with this theme.
hugo new theme test_theme_001
If you use a theme from hugo then hugo is fastest framework, but if you need to create a new theme then for me is as fast as any framework.

Friday, March 23, 2018

Fedora 27 : The LibreOffice the 6.0.2 and 5.4.6.2 versions.

The LibreOffice suite is a good choice for most linux users.
If you try to download the rpm file from the official website you will get the 6.0.2 version of this suite.
The Fedora 27 come with 5.4.6.2 version for this software.
Every announcement by the Document Foundation with updates contains many bug fixes and improvements and this repairs prevent Libreoffice crashes.
Maybe the new Fedora 28 will come with the last version of the LibreOffice version.

Saturday, March 17, 2018

Fedora 27 : Testing the new Django web framework .

Today I tested the Django web framework version 2.0.3 with python 3 on my Fedora 27 distro.
The main reason is to see if the Django and Fedora working well.
I used the pip to install and activate the virtual environment for python. First you need to create your project into your folder. I make one folder named django_001.
$ mkdir django_001
$ cd django_001
The next step is to create and activate the virtual environment for python language and your project.
$ python3 -m venv django_001_venv
$ source django_001_venv/bin/activate
Into this virtual environment named django_001_venv you will install django web framework.
pip install django
If you have problems with update pip then update this tool. Now start the django project named django_test.
$ django-admin startproject django_test
$ cd django_test
$ python3 manage.py runserver
Open the url http://127.0.0.1:8000/ with your web browser.
The result is this:

If you try to use the admin web with password and user you will see errors.
One of the most common problem for django come from settings, let's see some file from the project:

  • manage.py - this runs project specific tasks (the django-admin is used to execute system wide Django tasks) and is used to execute project specific tasks;
  • __init__.py - this file that allows Python packages to be imported from directories where it's present and it's a generic file used in almost all Python applications;
  • settings.py - the configuration settings for the Django project;
  • urls.py - contains URL patterns for the Django project; 
  • wsgi.py - is WSGI configuration properties for the Django project ( you don't need to setup WSGI to develop Django applications).

The next step is to create first django application.
$ python manage.py startapp django_blog
This make a folder named django_blog into the main django_test folder. Into the main django_test folder you have another django_test folder with settings.py file. Add into settings.py file the django_blog application.
INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'django_blog',
]
Let's fix some issues about admin and the django_blog application.
Into the main django_test folder with manage.py file use this:
$ python3 manage.py migrate
$ python3 manage.py createsuperuser

This fix the django framework and let you to add your superuser using the admin page, see:

The next issue is: create the website ( see the django_blog folder) using the Django web framework.
I don't have a issue for this django_blog but you can follow this tutorial link.

Wednesday, March 14, 2018

Fedora 27 : 'No Space Left on Device' errors .

The No Space Left on Device error is a good issue for a linux user.
The error come one issue that you have no space left on your hard drive.
The purpose of linux user is to detect the problem with the linux operating system.
You can use your root account or sudo user to run some of this linux commands.
This error named No Space Left on Device is just a vague problem and can be the cause of multiple vague errors on Linux systems.
Here are some ways you can solve the problem.

Use du and df commands to see if your disk is full (check into home and root folders area):
# df -h
# df -i /
# du -sh /

Check deleted file reserved by process (PID) with lsof:
# lsof / | grep deleted
Take a look at unlinked files:
# lsof -a +L1 *mountpoint*

Check you have bad filesystem blocks with fsck:
# fsck -vcck /dev/sda2

If you use a virtual machine (VM) then you can get this error in process of emulation of linux operating system for some PID.
It also happened to me with Android Studio software under Fedora 27 - the error is show like: No Space Left on Device.
I do not know why this happens, but I assume it's an emulation task in the memory area.

Monday, March 12, 2018

Fedora and childish ideas .

The marketing, design and promotion of any product is a key element of success.
I have to admit that although I am not an active member of Fedora distribution teams and I am glad to be able to help where it is needed.
Over the last time, I spend my online time with my son playing Roblox ( because he is away from me) and trying to show him what the computer can do for people.
This game allows development with the LUA programming language and object creation for users.
The idea that programs and games are essential factors in our lives.
Also the fact that I have been using Fedora for a long time, I have allowed myself to implement an intention to promote the Fedora distribution.
This is a shirt created with the Fedora logo and can be worn in the Roblox game. He found it here.

Monday, February 26, 2018

Fedora 27 : The LXMusic music player for LXDE.

The LXMusic come with version 0.4.7-4 , update and bugs fixes.
It is a minimalist music player for LXDE with very few features .
This simple XMMS frontend music player named LXMusic has very few features.
I used to playing my list of music files and works great.
The install can be done with dnf tool:
# dnf install lxmusic

Wednesday, February 21, 2018

Fedora 27 : selinux and getfattr attributes.

In this tutorial I show you how to use the getfattr command to get extended attributes of filesystem objects and security selinux.
One attribute is selinux.security for selinux and other like:

  • security.capability - the security.capability files stores Linux capabilities for the related file and is applies to binaries which are provided one or more capabilities via this file.
  • security.ima - for the Integrity Measurement Architecture (IMA), the file security.ima stores a hash or digital signature.
  • security.evm - this is similar to security.ima, the Extended Verification Module (EVM) stores a hash/HMAC or digital signature in this file ( the different with IMA is that it protects the metadata of the file, not the contents).

Now, about selinux.security :
You can use for example the getfattr command to perform specific security selinux tasks:

# getfattr -m security.selinux -d /etc/passwd
getfattr: Removing leading '/' from absolute path
names
# file: etc/passwd 
security.selinux="system_u:object_r:passwd_file_t:s0"
# getfattr -m security.selinux -d /etc/shadow
...
# getfattr -m security.selinux -d /var/www d /var/www
...
Both getfattr and setfattr commands has provided by the POSIX ACL package (Portable Operating Systems Interface).

Thursday, February 15, 2018

Fedora 27 : The strace tool for debug.

Today I test a great tool named strace from here.
This tool will help you with diagnostic, debugging and monitor between processes and the Linux kernel.

For example you can test this tool with ls command:
- to display only a specific system call, use the strace -e option as shown below.
$ strace -e open ls > /dev/null
- the result of this will come with all infos about count time, calls, and errors for each system call.
$ strace -c ls > /dev/null
- save the trace execution to a file:
$ strace -o output.txt ls
- display and save the strace for a given process id:
$ strace -p 1725 -o process_id_trace.txt

You can see more examples on the official webpage.

Tuesday, February 13, 2018

Fedora 27 : Test browsers for inline security.

Open the browser with this page: https://github.com.
Next step is to open the Developer Tools console.
If you use Opera then you can use this keys: Ctr+Shift +C .
If you use Firefox or Chrome browsers use F12 key.
Paste the following code into the console area to create a new inline script and add this java script:
var test = document.createElement('script');
test.innerText = 'alert("hi there");'
document.body.appendChild(test);
For example, this is a good security result on my Opera browser.

The result of this message tell us about the script we tried to execute was stopped by the browser.

Thursday, January 25, 2018

Fedora 27 : About storage management and LVM.

About storage management offering flexibility like a complex task and LVM contributes to this complexity.
If you have seen incorrect usage of LVM many times and users are often neither aware of the possibilities or alternatives for the particular storage stacks.
If you use a VirtualBox software the you can increase the vdi file:
VBoxManage modifyhd fedora.vdi --resize 30960
About LVM
The wikipedia tell us:
In Linux, Logical Volume Manager is a device mapper target that provides logical volume management for the Linux kernel. Most modern Linux distributions are LVM-aware to the point of being able to have their root file systems on a logical volume.

To create a LVM, we need to run through the following steps:
  • Select the physical storage devices for LVM 
  • Create the Volume Group from Physical Volumes 
  • Create Logical Volumes from Volume Group
All linux commands start in this case with lv and pv .
If you want to have a good management of storage then one most common task is :

The resize the PV (Physical Volume) with all free space.

All LVM commands start with lv so try to find all into your terminal by type lv ant then use keys TAB+TAB.
To resize the LVM use this commands:
$sudo su 
# pvs
  PV         VG              Fmt  Attr PSize   PFree
...
# lvdisplay
  --- Logical volume ---
  LV Path                /dev/fedora/root
  LV Name                
...
# lvextend -l+100%FREE /dev/fedora/root 
...
# df -Th
If you use Volume group on LVM then you need to use:
vgextend your_vg /dev/sda...

Wednesday, January 3, 2018

Fedora 27 : Fix your distro with package-cleanup command.

Happy New Year 2018 !
A new beginning for us, fedora distribution users, and I prefer to write about what we all use in Fedora and maybe is less well known by new  readers.
Let's start with the development process of Fedora distro come and all the installed kernels.
Normally reason why you maybe want remove kernels is limited disk space, fix problems and see what is wrong with your Fedora distro.
First issue is about installed kernels, use this command:
#rpm -q kernel
Install this package tool named dnf-utils (is a collection of add-on tool for dnf tool).
#dnf install dnf-utils
Let's start with this command, we see that several packages are seemingly installed more than once:
#package-cleanup --cleandupes
If there’s any remaining trouble with the yum database you can see with this command:
#package-cleanup --problems
To remove installed kernels from old Fedora distros use this command:
#package-cleanup --oldkernels --count=2
... the Fedora 27 use this command:
#package-cleanup --oldkernels 2
To obtain list of orphaned packages currently residing in the system:
#package-cleanup --leaves

Tuesday, December 19, 2017

Fedora 27 : Firefox and selinux : sepolgen tool .

To writing the actual policy for SELinux application, you can get many of the permissions your application needs by running.
First test if is installed into your Fedora distro.
I used Fedora 27 with SELinux set Enforcing.
If your application is named my_app then use this command:
sepolgen --init  /path/to/my_app
The result of this command will be this:
app.fc
my_app.sh
my_app.if
my_app_selinux.spec
my_app.te
If your application will be a rpm package, you can delete app.spec and app.sh.
The file with extension .te is a Type Enforcement file.

About this five files, the Linux help tells us:

Type Enforcing File NAME.te 
This file can be used to define all the types rules for a particular domain.

Note: Policy generated by sepolicy generate will automatically add a permissive DOMAIN
 to your te file. When you are satisfied that your policy works, you need to remove 
the permissive line from the te file to run your domain in enforcing mode.

Interface File NAME.if 
This file defines the interfaces for the types generated in the te file, which can 
be used by other policy domains.

File Context NAME.fc 
This file defines the default file context for the system, it takes the file types 
created in the te file and associates file paths to the types. Tools like restorecon
 and RPM will use these paths to put down labels.

RPM Spec File NAME_selinux.spec 
This file is an RPM SPEC file that can be used to install the SELinux policy on to
 machines and setup the labeling. The spec file also installs the interface file and
 a man page describing the policy. You can use sepolicy manpage -d NAME to generate 
the man page.

Shell File NAME.sh 
This is a helper shell script to compile, install and fix the labeling on your test 
system. It will also generate a man page based on the installed policy, and compile
 and build an RPM suitable to be installed on other machines
Open the my_app.te file will see something like this:
policy_module(my_app, 1.0.0)

########################################
#
# Declarations
#

type my_app_t;
type my_app_exec_t;
init_daemon_domain(my_app_t, my_app_exec_t)

# Please remove this once your policy works as expected.
permissive my_app_t;

########################################
#
# my_app local policy
#
allow my_app_t self:fifo_file rw_fifo_file_perms;
allow my_app_t self:unix_stream_socket create_stream_socket_perms;

domain_use_interactive_fds(my_app_t)
files_read_etc_files(my_app_t)
auth_use_nsswitch(my_app_t)
miscfiles_read_localization(my_app_t)
sysnet_dns_name_resolve(my_app_t)

The first line uses the name of the binary and will be the name of the policy and the version.
policy_module(my_app, 1.0.0)
The nest rows come with this:

type my_app_t;
type my_app_exec_t;
init_daemon_domain(my_app_t, my_app_exec_t)
- the unique type to describe this application is my_app_t.
- SELinux tells us we’ll be executing this file with my_app_exec_t.
- this program will run as a service: init_daemon_domain(my_app_t, my_app_exec_t).

The next row is about log permission errors ( but let the application continue to run).
permissive my_app_t;

The next rows show how the application use file permissions and if the application will use Unix steam.
Don't change it , you can get a google search to see more examples with this type of allow.
allow my_app_t self:fifo_file rw_fifo_file_perms;
allow my_app_t self:unix_stream_socket create_stream_socket_perms;

Abou this rows:
domain_use_interactive_fds(my_app_t)
files_read_etc_files(my_app_t)
auth_use_nsswitch(my_app_t)
miscfiles_read_localization(my_app_t)
sysnet_dns_name_resolve(my_app_t)

The domain_use_interactive_fds and term_use_all_terms support operations where SSH allocates a tty for the user( example the allow fifo_file supports the opposite).
The my_app want to read from /etc folder with files_read_etc_files.
The auth_use_nsswitch also can adds rules allowing access to NIS/YPBIND ports.
The miscfiles_read_localization is about localization code.

To better understand this tutorial, you can create a folder in your home directory and then test it with a different application from Fedora 27.
One good example: sepolgen --init /opt/firefox .

Sunday, December 17, 2017

Fedora 27 : Go and atom editor.

The Go programming language was created at Google in 2009 by Robert Griesemer, Rob Pike, and Ken Thompson.
The Go often referred to as golang is a programming language created at Google.
Using go with Fedora 27 is very simple , just install it with dnf tool.
#sudo dnf install golang
To use it with atom editor you need to install the atom editor , see this tutorial.
The next step is to set the atom editor with the packages for go programming language, like:
  • go-plus
  • go-get
  • go-imports
  • platformio-ide-terminal
The go command come with this help:
Go is a tool for managing Go source code.

Usage:

go command [arguments]
The commands are:

build       compile packages and dependencies
clean       remove object files
doc         show documentation for package or symbol
env         print Go environment information
bug         start a bug report
fix         run go tool fix on packages
fmt         run gofmt on package sources
generate    generate Go files by processing source
get         download and install packages and dependencies
install     compile and install packages and dependencies
list        list packages
run         compile and run Go program
test        test packages
tool        run specified go tool
version     print Go version
vet         run go tool vet on packages
Use "go help [command]" for more information about a command.

Additional help topics:

c           calling between Go and C
buildmode   description of build modes
filetype    file types
gopath      GOPATH environment variable
environment environment variables
importpath  import path syntax
packages    description of package lists
testflag    description of testing flags
testfunc    description of testing functions
The next step is to install your packages with go command and get:
go get -u golang.org/x/tools/
go get -u github.com/golang/lint/golint
Let's make a simple example:
package main
import "fmt"
func main() {
    fmt.Println("Hello world !")
}
Let's test it with go command. To run the program, create a file named hello-world.go put the code in and use go run:
$ go run hello-world.go
hello world
If you want to build our programs into binaries, we can do this using go build :
$ go build hello-world.go
$ ls
hello-world hello-world.go
Finally, we can then execute the built binary directly.
$ ./hello-world
hello world
After I searched the internet I found a website with many examples and I recommend it. You can find him here.

Thursday, December 14, 2017

Fedora 27 : Using atom editor with teletype.

The atom editor is a very good free and open-source text and source code editor for macOS, Linux, and Microsoft Windows.
This editor come with support for plug-ins written in Node.js, and embedded Git Control, developed by GitHub and more features.
Today I will show you how to install this tool with teletype into Fedora 27 distro linux.
Go to the Atom homepage from your web browser and click to download the RPM version.
Use this command to install it:
$sudo su 
#cd Download 
# dnf install atom.x86_64.rpm
Let's see this install:


The next step is to use teletype from atom.

Just install the teletype package into atom editor into settings area.
The teletype tool introduces the concept of real-time "portals" for sharing workspaces.
This tool uses WebRTC to encrypt all communication between collaborators.
Use the teletype with one click on the radio tower icon in the Atom status bar.
This will open a dialog into the right of the screen and ask you for teletype token.
You can get this token from here.
After you put the token then use the check button to share your content and atom teletype will get a ID.
Just share this ID with your development team to share your work.

Tuesday, December 12, 2017

Fedora 27 : About Cockpit linux tool.

About the Cockpit the official website tell us:
Cockpit makes Linux discoverable, allowing sysadmins to easily perform tasks such as starting containers, storage administration, network configuration, inspecting logs and so on.
If you use Fedora 27 the this tool can be used very easy.
If your Fedora Spin don't come with this tool then you can install it with this command:
#dnf -y install cockpit
First you need to follow this steps:
- starting Cockpit requires only a single command:
#systemctl start cockpit
- we’ll configure it to start on boot with:
#systemctl enable cockpit.socket
- you can check the status of Cockpit with:
#systemctl status cockpit
- the Cockpit tool runs on port 9090, so you’ll need to allow it through the firewall with this command:
#firewall-cmd --add-service=cockpit
- or simply add with the open port with:
#firewall-cmd --permanent --add-port=9090/tcp
- you now should reload the firewall for the rule to take effect:
#firewall-cmd --reload
Testing is the next step by log into Cockpit from your localhost (your server’s IP address) with your server’s root credentials.
Once you logged in you’ll see the Dashboard web page containing information about the server itself and graphs showing CPU and Memory Usage as well as Disk I/O and Network Traffic.
Let's see the Dashboard:
  • System come with infos about your system;
  • Logs displays the server’s system and service logs. That allows you to click on any entry for more detailed information, such as the process ID. 
  • Storage gives you a graphical look at disk reads and writes, and also allows you to view relevant logs. Also, you can set up and manage RAID devices and volume groups, and format, partition, and mount/unmount drives. 
  • Networking contains an overview of inbound and outbound traffic, logs and network interface information. You also can configure the network interface from this page. 
  • Containers allows you to manage your Docker containers. You can search for new containers, add or remove containers, start and stop them, and set runtime variables on this page. 
  • Accounts lets you to : add and manage users, set up and change passwords, and add and manage public SSH keys for each user. 
  • Services lists all services, and clicking on any entry takes you to a detail page showing the service log and allowing you to start/stop, enable/disable, reload/isolate, or mask/unmask each service.
  • Terminal let you a fully functional terminal, with tab completion, allowing you to perform any task you could perform through its web interface.This come with the same privileges your login credentials would allow via SSH.
You can take a look at documentation for Cockpit to learn more about this tool.

Friday, December 8, 2017

Fedora 27 : Firefox and selinux intro .

Today I made a summary of selinux.
This is a protection and security utility in linux operating systems.
It is quite complex and requires a little guidance in learning.
The basic thing is to secure a grid that matches the security gaps.
The tutorial today simply exemplifies how you can change these rules.
First, check with these commands for the status of selinux:
#getenforce
#sestatus
#sestatus -b
#cat /etc/selinux/config
#ls -lZ /usr/bin/firefox
#chcon -v -t user_home_t /user/bin/firefox
This will change the selinux target type to user_home_t . That will allow firefox to run with this label (like that users) are allowed to read/write and manage. This is the default label for all content in a users home directory. This last command try to prevent confined applications from being able to read and write this content just from users home.

Thursday, December 7, 2017

Fedora 27 : Testing Swift with Fedora linux .

I tested today a simple instalation of this package: dnf install swift.
This install come with all additional packets required for running .
This is an application ...
First, I thought in the first phase that they implemented a programming language from Apple .
Take a look at this screenshot: