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Figure 14.7: gsmb
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Useful Samba administration command line tools include: testparm, smbclient, smbstatus, and testprns. Useful Samba GUI administration tools include: Web Tools: SWAT, Webmin, SMB2WWW, and smbconftool. Windows Tools: bbSAT and smbedit. Other Tools: smb-mode.el and gsmb.
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15: Troubleshooting
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"Politics is the art of looking for trouble, finding it, misdiagnosing it, and then misapplying
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the wrong remedies." Groucho Marx Computers are somewhat like politics. Sooner or later trouble always shows up. It usually happens when you're making one small late-night change to a production service. You know the kind. It's always some preventative service patch for a problem you've never seen; one the vendor advises needs to be applied, assuring that it is only a benign software update. You apply the patch and dream of sleeping in late the following morning. Just as you're ready to call it a night, problem symptoms start showing up from multiple subsystems. SNMP monitor alerts are popping up everywhere announcing server failures all across the network. In a nervous adrenalin rush you rapidly try to back out the patch before it's too late. Halfway through, the uninstall task fails, your screen goes blank, and the phone begins to ring off the hook. Gruesome isn't it You can't avoid computer and network problems, but you can limit the scope of disaster. The trick is to always have a good selection of diagnostic tools at hand, and to have a sound fallback plan. When installing a new system, try it out first in an isolated test environment. When problems emerge in production systems, address them as a series of validation stages. Begin with the lowest-level subsystems. In turn, examine each higher-level service eliminating possibilities as you proceed. This process will assist in diagnosing events rooted in complex subsystem interrelationships.
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Sleuthing Samba
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Samba is an excellent example of a network service comprised of tightly coupled subsystems. It is therefore often helpful to address Samba problems in the stepwise manner described in the previous paragraph. Begin by verifying network connectivity from both the server and client end of a circuit. Next confirm that the smbd and nmbd are running and listening for connection requests. Ensure that the configuration files correctly reflect the role Samba is playing in the workgroup or domain. When all else fails, make sure you know where to go for help. In the following sections we'll look closely at validating Samba services at the network, daemon and configuration levels. Table 15.1 lists the set of tools we'll use as we analyze each component of the system. Table 15.1 Troubleshooting Tools
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Samba Tools
smbclient nmblookup testparm testprns
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UNIX Tools
ifconfig netstat ping ps iostat
Windows Client Tools
NET NBTSTAT WINIPCFG
Network Connectivity
Begin troubleshooting by examining network connectivity between clients and servers. Can everybody talk to each other over the wire Is everyone configured to support NetBIOS over TCP/IP Are the assigned IP addresses and subnets correct Use the ifconfig command on each UNIX client and server (Example 15.1) and the winipcfg command on Windows clients and servers (Figure 15.1) to verify network interface configuration. These commands will display adapter status, assigned IP address and subnet mask, and the broadcast address. Example 15.1 ifconfig UNIX Network Interface # ifconfig en0 en0: flags=a080863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX, MULTICAST,GROUPRT> inet 145.142.210.20 netmask 0xffffff00 broadcast 145.142.210.255
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Figure 15.1: winipcfg Windows network interface
Once you're certain that each systems network interface is operational, check reachability by using the ping command to send an ICMP echo request between problem systems (Example 15.2). Echo round-trip time and dropped-packet rate statistics are displayed, indicating the overall health of the communication path between the participating systems. Example 15.2 ping Verify Communication Path # ping foo.bar.com PING foo.bar.com (130.111.58.1): 56 data bytes 64 bytes from 130.111.58.1: icmp_seq=0 ttl=252 time=8 ms 64 bytes from 130.111.58.1: icmp_seq=1 ttl=252 time=3 ms 64 bytes from 130.111.58.1: icmp_seq=2 ttl=252 time=8 ms 64 bytes from 130.111.58.1: icmp_seq=3 ttl=252 time=5 ms --- foo.bar.com ping statistics --4 packets transmitted, 4 packets received, 0% packet loss round-trip min/avg/max = 3/5/8 ms In most cases reachability problems will be related to routing configuration or an incorrectly assigned subnet mask. Use the netstat command to display additional interface statistics (Table 15.2) including netmask and routing information (Example 15.3). An interval flag may be used with netstat to collect statistics snapshots over time. Table 15.2 Useful netstat Options
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