Boston Metro ClearCase Users Group March 27, 2001 ClearCase UNIX/NT Interoperability Using Samba

1
Boston Metro ClearCase Users GroupMarch 27,
2001ClearCase UNIX/NT Interoperability Using
Samba

• David Boyce
• David Darby

2
SMB

• What does SMB stand for?
• Server Message Block
• Used to be called Lanman
• Many old protocols for WfWg/win95/98/NT
• Also used for print sharing
• What does NFS stand for?
• Network File System

3
NFS vs. SMB

• Per-client setup unnecessary
• Microsofts SMB bias
• SMB not better per se
• Beneficial side effects

4
Other SMB Solutions

• Total Access Server
• Suns PC-Netlink / EAS
• Network Appliance
• Auspex
• Dave (Mac)
• EMC

5
Our Experiences

• Fidelity DiskAccess, Samba 2.0.3 2.0.7
• Progress Samba 2.0.7, NetApp
• Home Lab - Samba 2.2 PDC
• No discussion of printing

6
Samba Intro

• Read Rationals TAS documentation
• Version History and Capabilities
• lt 2.00 (1.9.18 - Stable 1.X version)
• 2.0.3 (works)
• 2.0.4 (requires bugfix)
• 2.0.5 (nktnw)
• 2.0.7 Works with ClearCase 4.1
• 2.2 Alpha still
• smbd nmbd daemons
• Oplocks always bad for interop
• PDC Support
• Build issues for multiple servers

7
Samba Risks

• Unsupported today supported soon?
• Whats the worst-case scenario? Occasional file
  corruptions.
• Can co-exist with NFS.

8
Downloading Building Samba

• Official Samba Site http//www.samba.org
• Current released version (samba-latest.tar.gz)
• http//us1.samba.org/samba/ftp/samba-latest.tar.gz
  
• Use Standard GNU Compiler
• http//www.sunfreeware.com
• Build (./configure prefix/opt/samba)
• Dont build in /tmp (checks file locking)

9
Samba Config Files

• /opt/samba/lib/smb.conf
• Global and per-share configuration
• Most keywords work in both places
• Use the testparm command
• White space is ignored on left of
• smbpassword map
• domain group map
• username map

10
Sample smb.conf (global)

• Global parameters
• server string Samba ClearCase VOB
  Server
• workgroup ltMY_DOMAINgt
• security DOMAIN
• encrypt passwords Yes
• password server ltPDCgt ltBDC1gt ltBDC2gt
• client code page 437
• max open files 1014
• max log size 2000
• wins server 155.1.58.55
• allow hosts 172.26.0.0/255.255.0.0
• guest account pcguest
• dont descend /view
• hosts deny lttroublesome machinegt

11
Sample smb.conf (per share)

• Per Share parameters
• vbstore
• comment ClearCase VOB Storage
• path /data/ccase/vbstore
• admin users vobadm clearcase_albd
• read list _at_ccusers
• write list _at_ccusers
• read only No
• vwstore
• comment ClearCase View Storage
• path /data/ccase/vwstore/NT
• admin users vobadm clearcase_albd
• read list _at_ccusers
• write list _at_ccusers
• read only No

12
PDC Group File Changes

• -------changed 1----------------------------ch
  anged to 1------------
• root0root
  root0root,vobadm,dsb
• --
• -------changed 5----------------------------ch
  anged to 5------------
• adm4root,adm,daemon
  adm4root,adm,daemon,vobadm,dsb
• --
• -------changed 13-------------------------chan
  ged to 13-15----------
• -
  ccusers29000vobadm,dsb,tom,sally
• 
  clearcase30001clearcase_albd
• -

13
User Map

• !vobadmclearcase_albd

14
Group Map

• rootAdministrators
• "Domain Admins"Domain Admins
• staffDomain Users

15
System Configuration 1

• /etc/services
• Samba Stuff
• swat 901/tcp
  Samba Windowed Admin Tool
• /etc/inetd.conf
• Samba Stuff
• swat stream tcp nowait.400 root
  /usr/local/samba/bin/swat swat

16
System Configuration 2

• /etc/rc2.d/S78samba
• ! /sbin/sh
• Startup script for Solaris 7/Samba 2
• David Boyce 8/9/99
• case "1" in
• start) /usr/local/samba/bin/smbd -D
• /usr/local/samba/bin/nmbd -D
• stop) /usr/bin/pkill 'snmbd'
• restartreset)
• /usr/bin/pkill 'snmbd'
• /usr/local/samba/bin/smbd -D
• /usr/local/samba/bin/nmbd -D
• /usr/bin/pgrep -l 'snmbd'
• ) echo "Usage 0 start stop restart
  " exit 1

17
Samba Web Administration Tool

• http//hostname901
• Best interface to documentation.
• Best interface to current activity.

18
Clearcase Interoperability

• Use shares liberally
• Network Perl
• Triggers
• View Profiles (requires a subdir)
• Config Specs
• Install areas
• Vob storage areas

19
Extra Benefits

• Homes share (H\)
• homes
• comment Home directory
• read only No
• browseable No
• Client side - smbsh, smbclient, smbtar
• Registry changes - rpcclient
• Good way to practice for TAS

20
Resources

• http//www.samba.org
• Many mailing lists there
• News comp.protocols.smb
• http//groups.google.com/
• http//www.ping.be/linux-and-samba/
• http//www.oreilly.com/catalog/samba/chapter/book/
  index.html

21
SFIO

• Fd900 text program
• Mnodes and setrlimit()

22
Tips

• Use hosts allow and hosts deny for rollout
  (and security).
• Use kill -USR1 ltpidgt to raise debug level and
  kill -USR2 to lower it.
• Samples - ftp//ftp.cleartool.com/pub/Samba