cluster:Cfengine/3/agent

From Dgiref

Please open a NGI-DE ticket if you experience any Installation or Configuration problem.

cfengine agent v.3.x

Prepare

Strictly speaking, the cfengine software do not use a client-server model. It can be named as an agent-server model, where server is an agent, installed into the master host. The reference installation configuration are stored into the subversion (svn) repository of Karlsruhe Institute of Technology. Thus, some preparation steps include:

download the dgiref.repo from http://mirror.scc.kit.edu/downloads/yum.repo/sl-dgiref.repo into /etc/yum.repos.d/
install subversion to communicate with svn server

Firewall configuration

Port 5308 should be open (how to open port in firewall).

administrator's script: prepare.sh

```
 
```
```
#!/bin/bash
```
```
# prepare cfengine masterhost
```
```
#-> start routine
```
```
#arch=i386
```
```
arch=x86_64
```

wget -O /etc/yum.repos.d/sl-dgiref.repo http://mirror.scc.kit.edu/downloads/yum.repo/sl-dgiref.repo

yum -y install subversion db4 pcre.$arch gcc openssl

```
#<- end routine
```

Install

The following step is needed to install a cfengine agent (execute as root user):

use yum or rpm to install cfengine masterhost from http://mirror.scc.kit.edu/downloads/

administrator's script: install.sh

```
 
```
```
#!/bin/bash
```
```
# install cfengine masterhost
```
```
#-> start routine
```
```
#p_arch="el4.i386"
```
```
p_arch="el5.x86_64"
```

rpm -ihv http://mirror.scc.kit.edu/downloads/rpms/cfengine/2010.2/cfengine-community-3.0.4-1.${p_arch}.rpm

#yum -y install cfengine-community-3.0.4-1

```
#<- end routine
```

Configure

To configure the cfengine v.3 agent, the following steps should be done:

download the cf3.preconf from codebase repository into cfengine directory /var/cfengine/
change mode to executable and execute /var/cfengine/cf3v.preconf bash script.
configure the site by changing the parameters in the /var/cfengine/masterfiles/inputs/library/variables.cf
run cf-agent to constrain cfengine master host configuration

administrator's script: configure.sh

```
 
```
```
#!/bin/bash
```
```
# prepare cfengine masterhost
```
```
#-> start routine
```

wget -O /var/cfengine/cf3.preconf http://dgiref.d-grid.de/svn/dgiref/PROD/cf3/cf3.preconf

```
chmod +x /var/cfengine/cf3.preconf
```
```
sh /var/cfengine/cf3.preconf PROD
```
```
# or 
```

# cp -r host_which_has_cf3_configs:/var/cfengine/masterfiles /var/cfengine/

# sh /var/cfengine/masterfiles/cf3-int.preconf

```
 
```

# configure the /var/cfengine/masterfiles/inputs/library/variables.cf

```
 
```
```
# run cf-agent
```
```
cf-agent -K
```
```
#<- end routine
```

Proceed

To run the agent use the cf-agent command.

administrator's script: proceed.sh

```
 
```
```
#!/bin/bash
```
```
# prepare cfengine masterhost
```
```
#-> start routine
```
```
# run cf-agent
```
```
cf-agent
```
```
#<- end routine
```

Initial test

Examine the output for the cf-agent or test the individual promise with cf-promise promise.name

administrator's script: test.sh

```
 
```
```
#!/bin/bash
```
```
# prepare cfengine masterhost
```
```
#-> start routine
```
```
# Examine the output for the cf-agent
```
```
cf-agent -vK
```
```
#<- end routine
```

Update

Use yum update/remove to update or remove the package.

administrator's script: update.sh

```
 
```
```
#!/bin/bash
```
```
# prepare cfengine masterhost
```
```
#-> start routine
```
```
# use yum to update
```
```
yum update cfengine-3.0.4
```
```
# use yum to remove
```
```
yum remove cfengine-3.0.4
```
```
#<- end routine
```

cluster:Cfengine/3/agent

Contents

cfengine agent v.3.x

Prepare

Install

Configure

Proceed

Initial test

Update

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