A lot of dvd/cd burning programs exists for Linux. Here is the ones I use for Fedora.

Find the scanbus device

cdrecord -scanbus

If a RW media is used it needs to be erased:

cdrecord blank=fast dev=5,0,0

Use the device found with scanbus

Finally burn the media:

cdrecord -v -eject speed=4 dev=5,0,0 image.iso

Use the device found with scanbus and the image you want to burn

If you prefer GUI you can use k3b. The KDE DVD & CD Kreator

k3b &

Delete content:

dvd+rw-format -force=fast /dev/dvdrw1 

Burn image:

growisofs -dvd-compat -Z /dev/dvdrw1=image.iso -speed=4

dumpet -i rhel-server-5.5-x86_64-dvd.iso
  Validation Entry:
      Header Indicator: 0x01 (Validation Entry)
      PlatformId: 0x00 (80x86)
      ID: ""
      Checksum: 0x55aa
      Key bytes: 0x55aa
  Boot Catalog Default Entry:
      Entry is bootable
      Boot Media emulation type: no emulation
      Media load segment: 0x0 (0000:7c00)
      System type: 0 (0x00)
      Load Sectors: 4 (0x0004)
      Load LBA: 518 (0x00000206)

mkisofs -r -o <name-of-ISO-file-to-be-created> /<directory-of-files>