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Install Cacti (Monitoring tool) on ubuntu 15.04 / 15.10 server.

4 de fevereiro de 2016 7 Comentários

Cacti is a complete network graphing solution designed to harness the power of RRDTool’s data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. All of this is wrapped in an intuitive, easy to use interface that makes sense for LAN-sized installations up to complex networks with hundreds of devices.

Features Graphs

Unlimited number of graph items can be defined for each graph optionally utilizing CDEFs or data sources from within cacti.
Automatic grouping of GPRINT graph items to AREA, STACK, and LINE[1-3] to allow for quick re-sequencing of graph items.
Auto-Padding support to make sure graph legend text lines up.
Graph data can be manipulated using the CDEF math functions built into RRDTool. These CDEF functions can be defined in cacti and can be used globally on each graph.
Support for all of RRDTool’s graph item types including AREA, STACK, LINE[1-3], GPRINT, COMMENT, VRULE, and HRULE.

Data Sources

Data sources can be created that utilize RRDTool’s “create” and “update” functions. Each data source can be used to gather local or remote data and placed on a graph.
Supports RRD files with more than one data source and can use an RRD file stored anywhere on the local file system.
Round robin archive (RRA) settings can be customized giving the user the ability to gather data on non-standard timespans while store varying amounts of data.

Data Gathering

Contains a “data input” mechanism which allows users to define custom scripts that can be used to gather data. Each script can contain arguments that must be entered for each data source created using the script (such as an IP address).
Built in SNMP support that can use php-snmp, ucd-snmp, or net-snmp.
Ability to retrieve data using SNMP or a script with an index. An example of this would be populating a list with IP interfaces or mounted partitions on a server. Integration with graph templates can be defined to enable one click graph creation for hosts.
A PHP-based poller is provided to execute scripts, retrieve SNMP data, and update your RRD files.

Templates

Graph templates enable common graphs to be grouped together by templating. Every field for a normal graph can be templated or specified on a per-graph basis.
Data source templates enable common data source types to be grouped together by templating. Every field for a normal data source can be templated or specified on a per-data source basis.
Host templates are a group of graph and data source templates that allow you to define common host types. Upon the creation of a host, it will automatically take on the properties of its template.

Graph Display

The tree view allows users to create “graph hierarchies” and place graphs on the tree. This is an easy way to manage/organize a large number of graphs.
The list view lists the title of each graph in one large list which links the user to the actual graph.
The preview view displays all of the graphs in one large list format. This is similar to the default view for the 14all cgi script for RRDTool/MRTG.

User Management

User based management allows administrators to create users and assign different levels of permissions to the cacti interface.
Permissions can be specified per-graph for each user, making cacti suitable for co location situations.
Each user can keep their own graph settings for varying viewing preferences.

Preparing your system

Before installing cacti you need to make sure you have installed Ubuntu 15.04 LAMP server.

Install Cacti on ubuntu 15.04 / 15.10 server

Open the terminal and run the following command

sudo apt-get install cacti-spine

The above command starts the cacti installation and you should see the first as php path change select ok and press enter

Now select the webserver you want to use (in my case it is apache2)

Cacti database configurations select yes

Enter database admin user password

Mysql application password for cacti

confirm the password

Now that Cacti is installed, we can start the configuration process on it.

Configuring cacti

Point your web browser towards http://YOURSERVERIP/cacti/install/ to start the initial setup and click next

Select new install option and click next

In the following screen you need to make sure you have all the required paths are correct and click on finish

Now login to Cacti with the default admin/admin, and change the password to something more sensible

After login in to Cacti you should see similar to the following screen

That is all!

Cacti, Linux, Monitoring

How to Install Plugin Mirage in Cacti

2 de fevereiro de 2016 1 comentário

Prerequisites:

Cacti version 0.8.8+ It may work on previous versions, but we haven’t tested against them.
PIA version 3.1

Download Mirage Plugin 1.2.0

Dowload Mega URL: https://mega.nz/#F!joBCSajS
Key: !5xOf-FjcDAkkS3K2TkAkTA

Installation:

Move the folder mirage to CACTI_HOME/plugins/
Ensure permission are correct (CACTI_HOME/plugins/mirage)

Install Mirage through Cacti Plugin Management /Enable Mirage pluging through Cacti Plugin Management

Review and save Mirage settings

After installation it should generate a file called ” mirage_poller_output.log ” within the / var / www / html / cacti / log /

That is all!

CentOS 7, Linux, RedHat 7

Easy Samba installation on RHEL/CentOS 7

1 de fevereiro de 2016 3 Comentários

Samba is a client/server system that implements network resource sharing for Linux and other UNIX computers. With Samba, UNIX files and printers can be shared with Windows clients and vice versa. Samba supports the Session Message Block (SMB) protocol. Nearly all Windows computers include SMB support with their internal network subsystems (NetBIOS in particular).
With an appropriately-configured Samba server on Linux, Windows clients can map drives to the Linux filesystems. Likewise, theSamba client on UNIX can connect to Windows shares by their UNC name. Although differences among various operating systems (such as filesystem naming conventions, end-of-line conventions, and authentication) can limit interoperability, Samba offers a generally serviceable mechanism for resource sharing on a heterogenous network.
In this tutorial we will show you how to install and configure Samba server on RHEL and CentOS 7 linux.

Install and configure Samba on Rhel/CentOS 7
To install samba packages enter following command:

#yum install samba samba-client samba-common -y

Now configure samba edit the file /etc/samba/smb.conf

#mv /etc/samba/smb.conf /etc/samba/smb.conf.bkp
#vi /etc/samba/smb.conf

and paste following line:

[global]
workgroup = WORKGROUP
server string = Samba Server %v
netbios name = centos
security = user
map to guest = bad user
dns proxy = no
#============================ Share Definitions ==============================
[Anonymous]
path = /samba/anonymous
browsable =yes
writable = yes
guest ok = yes
read only = no

Save the smb.conf file and restart the service:

#mkdir -p /samba/anonymous
#systemctl enable smb.service
#systemctl enable nmb.service
#systemctl restart smb.service
#systemctl restart nmb.service

Add these Iptables rules, so that samba will work perfectly:

#firewall-cmd --permanent --zone=public --add-service=samba
#firewall-cmd --reload

Change permission for samba share:

#chmod -R 0755 anonymous/
#chown -R nobody:nobody anonymous/

Further we need to allow the selinux for the samba configuration as follows:

#chcon -t samba_share_t anonymous/

Now you can access the Centos 7.0 sharing in windows as follows, go to the Run prompt and type \centos :

Acesse \\centos

Now anonymous user can browse & create new text documents:

Secured samba server

For this I will create a group smbgrp & user rasho to access the samba server with proper authentication

#useradd rasho
#groupadd smbgrp
#usermod -a -G smbgrp rasho
#smbpasswd -a rasho

[root@localhost]# smbpasswd -a rasho
New SMB password: YOUR SAMBA PASS
Retype new SMB password: REPEAT YOUR SAMBA PASS
Added user rasho.

Create a new share, set the permission on the share:

#mkdir /home/secure
#chown -R rasho:smbgrp /home/secure/
#chmod -R 0770 /home/secure/
#chcon -t samba_share_t /home/secure/

Again edit the configuration file as :

#vi /etc/samba/smb.conf

Add the newly created samba share in smb.conf file:

[Secure]
path = /home/secure
valid users = @smbgrp
guest ok = no
writable = yes
browsable = yes

Restart the samba service:

#systemctl restart smb.service
#systemctl restart nmb.service

Now at windows machine check the folder now with the proper credentials

Open samba sharing

Create new text documents:

That is all!

CentOS 7, Linux

How to configure Btrfs on Centos 7

29 de janeiro de 2016 4 Comentários

Check unit to add

#fdisk -l

Return:

Exemplo:
Selecione o disco
Disk /dev/sdb: 17.2 GB, 17179869184 bytes, 33554432 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Adding partition:

#fdisk /dev/sdb
# M – “Show all options available”
# P – “Type ” p” to display information on the disc as the current partitions”
# n – “Show all options available”
# p – “primary partition”
# 1 – “Partition number 1”
# enter – “default”
# enter – “default”
# w “List unit”

Check unit created

# fdisk -l

Check BTRFS Version and Installation

#yum search btrfs
#yum install btrfs-progs.x86_64

FSTAB access the file and add the mount point and compression

#vim /etc/fstab

Add the following line:

/dev/sdb1 /opt btrfs compress=zlib,compress-force=zlib 1 1

Assembling Compression :

#mkfs.btrfs /dev/sdb1 -f

Restart the machine and starting from this moment the unit / opt ‘ll be using btrfs to compress the files.

Hypervisor, Vmware

How to set a static MAC address on VMware ESXi virtual machine

23 de janeiro de 2016 5 Comentários

Question: I want to assign a static MAC address to a virtual machine (VM) on VMware ESXi. However, when I attempt to start a VM with a static MAC address, the VM fails to start and throws an error “The MAC Address entered is not in the valid range. Valid values are between “xx:xx:xx:xx:xx:xx” and “xx:xx:xx:xx:xx”.

When you create a VM on VMware ESXi, each network interface of the VM is assigned a dynamically generated MAC address. If you want to change this default behavior and assign a static MAC address to your VM, here is how to do it.

As you can see above, VMware’s vSphere GUI client already has a menu for setting a static MAC address for a VM. However, this GUI-based method only allows you to choose a static MAC address from 00:50:56:xx:xx:xx, which is VMware-reserved MAC address range. If you attempt to set any arbitrary MAC address outside this MAC range, you will fail to launch the VM, and get the following error.

Fortunately, there is a workaround to this limitation. The solution is, instead of using vSphere GUI client, editing .vmx file of your VM directly, after logging in to the ESXi host.

First, turn off the VM to which you want to assign a static MAC address.

Enable SSH access to your ESXi host if you haven’t done it already. Then log in to the ESXi host via SSH.

Move to the directory where your VM’s .vmx file is located:

# cd vmfs/volumes/datastore1/[name-of-vm]

Open .vmx file with a text editor, and add the following fields. Replace the MAC address field with your own.

#ethernet0.addressType = "static"
#ethernet0.checkMACAddress = "false"
#ethernet0.address = "00:0c:29:1f:4b:ac"

Now you should be able to launch a VM with the static MAC address you defined in .vmx file.

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