Article Number: 549 Rating: Unrated Last Updated: Tue, May 30, 2017 at 11:02 AM

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1 Configuring Your Server With A Static IP Address Article Number: 549 Rating: Unrated Last Updated: Tue, May 30, 2017 at 11:02 AM O ve r vie w This KB article shows you how to configure your Nagios server with a static IP address. This KB article applies to both RHEL and CentOS, there are separate sections for v 6.x and v 7.x. This applies to Nagios Fusion, Nagios Log Server, Nagios Network Analyzer and Nagios XI. There is also a dedicated section for each individual product that explains any specific changes that are required. You will need to perform these changes while logged in as the root user. Due to the nature of these changes it is recommended that you perform the actions while logged onto the c o ns o le of the server, performing the changes from an SSH session may disconnect you from the server. RHEL / C e nt O S 6.x Us ing s ys t e m-c o nf ig-ne t wo rk There's an easy way to perform these changes using system-config-network (a text based GUI). In your console session execute the command: system-config-network If you receive the following error: -bash: system-config-network: command not found Then you have two options: O p tio n 1) Install the package using yum (which assumes your server has internet access via it's DHCP address): yum install -y system-config-network-tui Once installed execute the command again and proceed with the next step. O p tio n 2 ) Manually configure address in config file. Please follow the steps in the "Manual IP Configuration" section that explains how to do this. When you execute system-config-network you will be prompted with a text based GUI: Press Ente r on De vic e c o nfig ura tio n You will presented with the "Select A Device" screen:

2 e th0 should be the default interface selected, press Ente r You will now be presented with the "Network Configuration" screen. Press the Do wn Arro w on your keyboard until you are in the Us e DHC P field Press the S p a c e b a r and the * will disappear Press the Do wn Arro w on your keyboard until you are in the StaS tic IP field Type in your IP Address Repeat these steps on the Netmask, Default gateway IP, Primary DNS Server, Secondary DNS Server fields The following screenshot is an example: When the O K button is selected press Ente r to save the changes You will be returned to the "Select A Device" screen. Press Ta b until the S a ve button is highlighted and then press Ente r You will be returned to the "Select Action" screen. Press Ta b until the S a ve &Q uit button is highlighted and then press Ente r Now you will need to take the interface "down" and then back "up" again using the following commands: ifdown eth0 ifup eth0 Execute these commands to check your changes have been applied and that they are working: ping -c 4

3 The important items in the output should be that the interface is in an UP state AND the ine t address is correct. If you wish to define an IPv6 address then you will need to follow the steps in the "Manually Configuring An IPv6 Address" section. Manual IP C onf igurat ion If you are unable to use system-config-network (a text based GUI) to configure your IP address then you will need to configure the interface in the text based configuration file for that interface. First you will need to identify the name of the network interface, type the following command: Here you can see the name of the interface is e th0 The config file for this interface will be in the file /etc/sysconfig/network-scripts/ifcfg-eth0 Open the vi editor using this command: vi /etc/sysconfig/network-scripts/ifcfg-eth0 When using the vi editor, to make changes press i on the keyboard first to enter insert mode. Press Esc to exit insert mode. The default configuration will appear something like: DEVICE=eth0 TYPE=Ethernet UUID=18b83e30-a b2e-99abc0c5decf NM_CONTROLLED=yes BOOTPROTO=dhcp HWADDR=00:0C:29:86:BB:B3 DEFROUTE=yes PEERDNS=yes PEERROUTES=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="System eth0" The following lines need changing in the file: BOOTPROTO=dhcp

4 To: BOOTPROTO=none The following lines need to be added to the file (you will need to adjust them to your requirements): IPADDR= NETMASK= GATEWAY= DNS1= DNS2= USERCTL=no The final configuration would look like this: DEVICE=eth0 TYPE=Ethernet UUID=18b83e30-a b2e-99abc0c5decf NM_CONTROLLED=yes BOOTPROTO=none HWADDR=00:0C:29:86:BB:B3 DEFROUTE=yes PEERDNS=yes PEERROUTES=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="System eth0" IPADDR= NETMASK= GATEWAY= DNS1= DNS2= USERCTL=no Save the changes in vi by typing :wq and pressing Ente r. Now you will need to take the interface "down" and then back "up" again using the following commands: ifdown eth0 ifup eth0 Execute these commands to check your changes have been applied and that they are working: ping -c 4 If you wish to define an IPv6 address then you will need to follow the steps in the "Manually Configuring An IPv6 Address" section.

5 Manually C onf iguring An IPv6 Addre s s If you need to use an IPv6 address then you will need to configure the interface in the text based configuration file for that interface First you will need to identify the name of the network interface, type the following command: Here you can see the name of the interface is e th0 The config file for this interface will be in the file /etc/sysconfig/network-scripts/ifcfg-eth0 Open the vi editor using this command: vi /etc/sysconfig/network-scripts/ifcfg-eth0 When using the vi editor, to make changes press i on the keyboard first to enter insert mode. Press Esc to exit insert mode. Assuming you already have defined a static IPv4 address, your configuration will appear something like: DEVICE=eth0 TYPE=Ethernet UUID=18b83e30-a b2e-99abc0c5decf NM_CONTROLLED=yes BOOTPROTO=none HWADDR=00:0C:29:86:BB:B3 DEFROUTE=yes PEERDNS=yes PEERROUTES=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="System eth0" IPADDR= NETMASK= GATEWAY= DNS1= DNS2= USERCTL=no The following lines need changing in the file: IPV6INIT=no To: IPV6INIT=yes The following lines need to be added to the file (you will need to adjust them to your requirements): IPV6ADDR=2001:44b8:3132:25:10:25:40:60/64 IPV6_DEFAULTGW=2001:44b8:3132:25:10:25:1:253 DNS3=2001:44b8:3132:25:10:25:2:1 DNS4=2001:44b8:3132:25:10:25:2:2 The final configuration would look like this: DEVICE=eth0 TYPE=Ethernet UUID=18b83e30-a b2e-99abc0c5decf

6 NM_CONTROLLED=yes BOOTPROTO=none HWADDR=00:0C:29:86:BB:B3 DEFROUTE=yes PEERDNS=yes PEERROUTES=yes IPV4_FAILURE_FATAL=yes IPV6INIT=yes NAME="System eth0" IPADDR= NETMASK= GATEWAY= DNS1= DNS2= USERCTL=no IPV6ADDR=2001:44b8:3132:25:10:25:40:60/64 IPV6_DEFAULTGW=2001:44b8:3132:25:10:25:1:253 DNS3=2001:44b8:3132:25:10:25:2:1 DNS4=2001:44b8:3132:25:10:25:2:2 Save the changes in vi by typing :wq and pressing Ente r. Now you will need to take the interface "down" and then back "up" again using the following commands: ifdown eth0 ifup eth0 Execute these commands to check your changes have been applied and that they are working: ping6 -c 4 RHEL / C e nt O S 7.x Us ing nmt ui There's an easy way to perform these changes using nmtui (a text based GUI). In your console session execute the command: nmtui If you receive the following error: -bash: nmtui: command not found Then you have two options: O p tio n 1) Install the package using yum (which assumes your server has internet access via it's DHCP address):

7 yum install -y net-tools Once installed execute the command again and proceed with the next step. O p tio n 2 ) Manually configure address in config file. Please follow the steps in the "Manual IP Configuration" section that explains how to do this. When you execute nmtui you will be prompted with a text based GUI: Press Ente r on Ed it a c o nne c tio n You will presented with a list of devices: In this example e no is the default interface selected, press Ente r You will now be presented with the "Edit Connection" screen. Press Ta b on your keyboard until you are on <Auto ma tic > selector next to IPv4 C ONFIGURATIONO N Press Ente r, select Ma nua l from the list and press Ente r Press Ta b until you are on <S ho w> (for IPv4) and press Ente r More fields will be shown on the screen Press Ta b until you are on <Ad d > selector next to Ad d re s s e s Type a valid address with using CIDR notation, for example /16 Repeat these steps for the Gateway IP and DNS Servers fields If you want to define a s ta tic IP v6 a d d re s s, follow the same steps above for the IPv6 C ONFIGURATION O N section. The following screenshot is an example configuration:

8 Press Ta b until the O K button is selected press Ente r to save the changes You will be returned to the "Select A Device" screen. Press Ta b until the Q uit button is highlighted and then press Ente r Now you will need to take the interface "down" and then back "up" again using the following commands: ifdown eno ifup eno Execute these commands to check your changes have been applied and that they are working: ping -c 4

9 The important items in the output should be that the interface is in an UP state AND the ine t address is correct (and inet6 if defined). Manual IP C onf igurat ion If you are unable to use nmuti (a text based GUI) to configure your IP address then you will need to configure the interface in the text based configuration file for that interface. First you will need to identify the name of the network interface, type the following command: Here you can see the name of the interface is e no The config file for this interface will be in the file /etc/sysconfig/network-scripts/ifcfg-eno Open the vi editor using this command: vi /etc/sysconfig/network-scripts/ifcfg-eno When using the vi editor, to make changes press i on the keyboard first to enter insert mode. Press Esc to exit insert mode.

10 The default configuration will appear something like: TYPE=Ethernet BOOTPROTO=dhcp DEFROUTE=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no NAME=eno UUID=3de c-48cd-96bb-6a5a9c8aa91e DEVICE=eno PEERDNS=yes PEERROUTES=yes IPV6_PEERDNS=yes IPV6_PEERROUTES=yes IPV6_PRIVACY=no The following lines need c ha ng ing in the file: IP v4 To: BOOTPROTO=dhcp BOOTPROTO=none IP v6 To: IPV6_AUTOCONF=yes IPV6_AUTOCONF=no The following lines need re mo ving from the file: IP v4 PEERDNS=yes PEERROUTES=yes IP v6 IPV6_PEERDNS=yes IPV6_PEERROUTES=yes The following lines need to be a d d e d to the file (you will need to adjust them to your requirements): IP v4 IPADDR= PREFIX=16 GATEWAY= DNS1= DNS2= IP v6 IPV6ADDR=2001:44b8:3132:25:10:25:40:70/64 IPV6_DEFAULTGW=2001:44b8:3132:25:10:25:1:253 DNS3=2001:44b8:3132:25:10:25:2:1 DNS4=2001:44b8:3132:25:10:25:2:2 The final configuration would look like this: TYPE=Ethernet BOOTPROTO=none DEFROUTE=yes

11 IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=no IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no NAME=eno UUID=3de c-48cd-96bb-6a5a9c8aa91e DEVICE=eno IPV6_PRIVACY=no IPADDR= PREFIX=16 GATEWAY= DNS1= DNS2= IPV6ADDR=2001:44b8:3132:25:10:25:40:70/64 IPV6_DEFAULTGW=2001:44b8:3132:25:10:25:1:253 DNS3=2001:44b8:3132:25:10:25:2:1 DNS4=2001:44b8:3132:25:10:25:2:2 Save the changes in vi by typing :wq and pressing Ente r. Now you will need to take the interface "down" and then back "up" again using the following commands: ifdown eno ifup eno Execute these commands to check your changes have been applied and that they are working: ping -c 4 ping6 -c 4 Na gio s Fus io n S pe c if ic S e t t ings After changing the IP address on your server you should check that the Program URL is correct. Admin > System Config > Ma na g e S ys te m C o nfig

12 Ge ne ra l P ro g ra m S e tting s Make sure the P ro g ra m URL is correct. If a DNS entry is used make sure that this resolves to your new IP address. Na gio s Lo g S e r ve r S pe c if ic S e t t ings After changing the IP address on your server you should check that the Interface URL is correct. Administration > General > Glo b a l S e tting s Make sure the Inte rfa c e URL is correct. If a DNS entry is used make sure that this resolves to your new IP address. In addition to this, on ALL nodes you need to check the following file has the correct IP addresses: /usr/local/nagioslogserver/var/cluster_hosts Na gio s Ne t wo r k Ana lyz e r S pe c if ic S e t t ings There are no additional changes required. Na gio s XI S pe c if ic S e t t ings After changing the IP address on your server you should check that the Program URL is correct. Admin > System Config > S ys te m S e tting s Ge ne ra l tab Make sure the P ro g ra m URL is correct. If a DNS entry is used make sure that this resolves to your new IP address. lo c a lho s t Ent r y I n /e t c /ho s t s It has been observed that sometimes the system-config-network or nmtui tool removes the localhost entries from the /etc/hosts file. Edit your /etc/hosts file and make sure there are localhost entries. For example: localhost.localdomain localhost.localdomain localhost4 localhost4.localdomain4 localhost xi-c6x-x64 ::1 localhost.localdomain localhost.localdomain localhost6 localhost6.localdomain6 localhost xi-c6x-x64 Tr o uble s ho o t ing After you change the IP address and reboot the server you find that the interface is in the DOWN state. The following line needs c ha ng ing in the config file: ONBOOT=no To: Fina l Tho ught s For any support related questions please visit the Nagios Support Forums at:

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