issues with resolving

**anony_alien** · 11-07-2012

Hi,

Having troubles getting centos hostname to be resolved.

Server is running CentOS release 6.3 (Final)

can't ping it, and when i nslookup the name, local dns server does not see it.
I'm having troubles with smb, it does not start for some unknown error which I don't understand what to fix as the messages from the log is not detailed on trying to start
samba

Code:

service smb start

resulting:

Code:

Starting SMB services:                                     [FAILED]

also on:

Code:

service smb restart

Code:

Shutting down SMB services:                                [FAILED]
Starting SMB services:                                     [FAILED]

message from log:

Code:

Nov  7 14:44:04 dataprobe-1 smbd[14186]: [2012/11/07 14:44:04.476049,  0] smbd/server.c:1156(main)
Nov  7 14:44:04 dataprobe-1 smbd[14186]:   error opening config file

smb.conf file has the following lines:

Code:

   workgroup = DOMAIN
   password server = dcontroller.domain.com
   realm = DOMAIN.COM
   security = ads
   idmap uid = 10000-20000
   idmap gid = 10000-20000
   template homedir = /home/%D/%U
   template shell = /bin/bash
#   winbind use default domain = true
   winbind offline logon = false

#--authconfig--end-line--
;   workgroup = DOMAIN
;   realm = DOMAIN.COM
#   server string =
;   use kerberos keytab = yes
;   kerberos method = system keytab
   kerberos method = secrets and keytab
   enable privileges = yes
   printcap name = cups
   load printers = yes
   printing = cups
   log file = /var/log/samba/log.%m
   max log size = 50
   log level = 5
   interfaces = bond0 lo
   bind interfaces only = yes
;  hosts allow = 192.168.1. 192.168.2. 127.
   map to guest = bad user
;   security = ads
   auth methods = winbind
   encrypt passwords = yes
;  winbind separator = +
   winbind use default domain = yes
;   template homedir = /home/%D/%U
   obey pam restrictions = yes
;   template shell = /bin/bash

   socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192

   local master = no
   os level = 33
;  domain master = yes
;  preferred master = yes

;   idmap uid = 10000-20000
;   idmap gid = 10000-20000
   winbind enum users = yes
   winbind enum groups = yes
   winbind refresh tickets = yes
   client use spnego = yes
   client ntlmv2 auth = yes

   wins server = dcontroller.domain.com

   dns proxy = no

# 8. File Naming Options:
# Case Preservation can be handy - system default is _no_
# NOTE: These can be set on a per share basis
;  preserve case = no
;  short preserve case = no
# Default case is normally upper case for all DOS files
;  default case = lower
# Be very careful with case sensitivity - it can break things!
;  case sensitive = no

    dos charset = ASCII
    unix charset = UTF8
    display charset = UTF8

#============================ Share Definitions ==============================
[homes]
   comment = Home Directories
   browseable = no
   writable = yes
# You can enable VFS recycle bin on a per share basis:
# Uncomment the next 2 lines (make sure you create a
# .recycle folder in the base of the share and ensure
# all users will have write access to it. See
# examples/VFS/recycle/REAME in the samba docs for details
;   vfs object = /usr/lib/samba/vfs/recycle.so

# [documentation]
#    path = /home/documentation
#    comment = Public Documentation Directory
#    browseable = yes
#    writable = yes
#    public = yes

The following is nsswitch.conf:

Code:

#
# /etc/nsswitch.conf
#
# An example Name Service Switch config file. This file should be
# sorted with the most-used services at the beginning.
#
# The entry '[NOTFOUND=return]' means that the search for an
# entry should stop if the search in the previous entry turned
# up nothing. Note that if the search failed due to some other reason
# (like no NIS server responding) then the search continues with the
# next entry.
#
# Valid entries include:
#
#       nisplus                 Use NIS+ (NIS version 3)
#       nis                     Use NIS (NIS version 2), also called YP
#       dns                     Use DNS (Domain Name Service)
#       files                   Use the local files
#       db                      Use the local database (.db) files
#       compat                  Use NIS on compat mode
#       hesiod                  Use Hesiod for user lookups
#       [NOTFOUND=return]       Stop searching if not found so far
#

# To use db, put the "db" in front of "files" for entries you want to be
# looked up first in the databases
#
# Example:
#passwd:    db files nisplus nis
#shadow:    db files nisplus nis
#group:     db files nisplus nis

passwd:     compat winbind
shadow:     compat winbind
group:      compat winbind

#hosts:     db files nisplus nis dns
hosts:      files dns winbind

# Example - obey only what nisplus tells us...
#services:   nisplus [NOTFOUND=return] files
#networks:   nisplus [NOTFOUND=return] files
#protocols:  nisplus [NOTFOUND=return] files
#rpc:        nisplus [NOTFOUND=return] files
#ethers:     nisplus [NOTFOUND=return] files
#netmasks:   nisplus [NOTFOUND=return] files

bootparams: nisplus [NOTFOUND=return] files

ethers:     db files
netmasks:   files
networks:   files dns
protocols:  db files
rpc:        db files
services:   db files

netgroup:   files

# publickey:  nisplus

automount:  files
aliases:    files

resolv.conf has the following information:

Code:

domain domain.com
search domain.com
nameserver 192.168.1.254

I have no problem pinging its' ip address, and accessing it via typing its' ip, but not able to access or ping it by it's hostname server-1.

Would really appreciate any assitance into this.

***atreyu*** · 11-07-2012

Originally Posted by anony_alien

Having troubles getting centos hostname to be resolved.

Server is running CentOS release 6.3 (Final)

can't ping it, and when i nslookup the name, local dns server does not see it.

Hi,

In order to resolve your hostname locally, just enter the hostname in the file /etc/hosts, using the ip address that you normally use to access it, e.g.:

Code:

192.168.1.2       server-1

If you need to resolve it from another host on the network, you can put the same entry in that files /etc/hosts file. If you want to resolve the ip address from the internet, then yeah, you need an FQDN and a DNS record. You probably don't need that, though.

I'm having troubles with smb, it does not start for some unknown error which I don't understand what to fix as the messages from the log is not detailed on trying to start
samba

Code:

Nov  7 14:44:04 dataprobe-1 smbd[14186]: [2012/11/07 14:44:04.476049,  0] smbd/server.c:1156(main)
Nov  7 14:44:04 dataprobe-1 smbd[14186]:   error opening config file

Where is the smb.conf file that you posted located on your filesystem? It should be here:

Code:

# ls -l /etc/samba/smb.conf
-rw-r--r-- 1 root root 11835 May 21 00:29 /etc/samba/smb.conf

**anony_alien** · 11-07-2012

Originally Posted by atreyu

Hi,

In order to resolve your hostname locally, just enter the hostname in the file /etc/hosts, using the ip address that you normally use to access it, e.g.:

Code:

192.168.1.2       server-1

If you need to resolve it from another host on the network, you can put the same entry in that files /etc/hosts file. If you want to resolve the ip address from the internet, then yeah, you need an FQDN and a DNS record. You probably don't need that, though.

Where is the smb.conf file that you posted located on your filesystem? It should be here:

Code:

# ls -l /etc/samba/smb.conf
-rw-r--r-- 1 root root 11835 May 21 00:29 /etc/samba/smb.conf

Thanks for the reply atreyu,

For the DNS part,
I have a dns server which resolves the names using dnsmasq service, it's only for local use,
I don't want to do it by the hosts file, as I want to pick it up automatically from my dns server, no need for a fqdn record, just internal use.

SMB file:
smb file is locate in /etc/samba/smb.conf:

Code:

[root@server-1 samba]# pwd
/etc/samba
[root@server-1 samba]#  ls -l
total 28
-rw-r--r--. 1 root         root             20 Jun 22 22:18 lmhosts
-rw-r--r--. 1 user domain admins  2709 Oct 31 18:51 smb.conf
-rw-r--r--. 1 root         root          10299 Oct 10 11:08 smb.conf.bak
-rw-r--r--. 1 root         root           2780 Oct 26 13:49 smbconf.bak
-rw-r--r--. 1 root         root             97 Jun 22 22:18 smbusers

**anony_alien** · 11-07-2012

Originally Posted by anony_alien

Thanks for the reply atreyu,

For the DNS part,
I have a dns server which resolves the names using dnsmasq service, it's only for local use,
I don't want to do it by the hosts file, as I want to pick it up automatically from my dns server, no need for a fqdn record, just internal use.

SMB file:
smb file is locate in /etc/samba/smb.conf:

Code:

[root@server-1 samba]# pwd
/etc/samba
[root@server-1 samba]#  ls -l
total 28
-rw-r--r--. 1 root         root             20 Jun 22 22:18 lmhosts
-rw-r--r--. 1 user domain admins  2709 Oct 31 18:51 smb.conf
-rw-r--r--. 1 root         root          10299 Oct 10 11:08 smb.conf.bak
-rw-r--r--. 1 root         root           2780 Oct 26 13:49 smbconf.bak
-rw-r--r--. 1 root         root             97 Jun 22 22:18 smbusers

Forgot to mention that nmb is also failing to start, and
it's something to do with smb.conf i believe.

***atreyu*** · 11-07-2012

Originally Posted by anony_alien

I have a dns server which resolves the names using dnsmasq service, it's only for local use,
I don't want to do it by the hosts file, as I want to pick it up automatically from my dns server, no need for a fqdn record, just internal use.

so have you tried to configure dnsmasq to resolve local addresses and it is not working? i've never used dnsmasq, but i'm sure there has to be some sort of configuration you need to do first. maybe in /etc/dnsmasq.conf (see the local= parameter for example). also read up on the man page, if you haven't already:

Code:

man dnsmasq

Code:

[root@server-1 samba]# pwd
/etc/samba
[root@server-1 samba]#  ls -l
total 28
-rw-r--r--. 1 root         root             20 Jun 22 22:18 lmhosts
-rw-r--r--. 1 user domain admins  2709 Oct 31 18:51 smb.conf
-rw-r--r--. 1 root         root          10299 Oct 10 11:08 smb.conf.bak
-rw-r--r--. 1 root         root           2780 Oct 26 13:49 smbconf.bak
-rw-r--r--. 1 root         root             97 Jun 22 22:18 smbusers

that smb.conf file is group-owned by "domain admins"? i've never seen/used a group w/spaces, interesting. can you put the default smb.conf back (with root ownership) and restart, just to see if you can get it to work that way?

Also is there any additional info in /var/log/messages or the samba logs (usually in the /var/log/samba/ dir)?

**anony_alien** · 11-08-2012

Thanks for getting back atreyu,

dnsmasq is already configured on another server, and working perfectly well.

all other servers are resolved well, its only with the centos hosts I'm having trouble getting to resolve.

Yeah, you are right there are logs in /var/log/samba/

on commencing the code:

Code:

 

tail -f log.smbd

and on trying to start the service

Code:

service smb start

it fails and on the the message on log.smbd

Code:

[2012/11/08 12:44:49,  0] smbd/server.c:1141(main)
  smbd version 3.5.10-125.el6 started.
  Copyright Andrew Tridgell and the Samba Team 1992-2010
[2012/11/08 12:44:49.054235,  1] ../lib/util/params.c:513(OpenConfFile)
  params.c:OpenConfFile() - Unable to open configuration file "/etc/samba/smb.conf":
        Permission denied
[2012/11/08 12:44:49.054895,  0] smbd/server.c:1156(main)
  error opening config file

I did try to bring back smb conf, that will work, but then,
active directory integtration does not work.

As I binded it to our active directory.

Originally Posted by atreyu

so have you tried to configure dnsmasq to resolve local addresses and it is not working? i've never used dnsmasq, but i'm sure there has to be some sort of configuration you need to do first. maybe in /etc/dnsmasq.conf (see the local= parameter for example). also read up on the man page, if you haven't already:

Code:

man dnsmasq

that smb.conf file is group-owned by "domain admins"? i've never seen/used a group w/spaces, interesting. can you put the default smb.conf back (with root ownership) and restart, just to see if you can get it to work that way?

Also is there any additional info in /var/log/messages or the samba logs (usually in the /var/log/samba/ dir)?

***atreyu*** · 11-08-2012

Originally Posted by anony_alien

dnsmasq is already configured on another server, and working perfectly well.

all other servers are resolved well, its only with the centos hosts I'm having trouble getting to resolve.

Is it working on other DNS clients that are Linux hosts, or are they Windows hosts?

you have this in /etc/resolv.conf:

Code:

nameserver 192.168.1.254

I assume that is the ip address of the dnsmasq server?

Code:

[2012/11/08 12:44:49,  0] smbd/server.c:1141(main)
  smbd version 3.5.10-125.el6 started.
  Copyright Andrew Tridgell and the Samba Team 1992-2010
[2012/11/08 12:44:49.054235,  1] ../lib/util/params.c:513(OpenConfFile)
  params.c:OpenConfFile() - Unable to open configuration file "/etc/samba/smb.conf":
        Permission denied
[2012/11/08 12:44:49.054895,  0] smbd/server.c:1156(main)
  error opening config file

I did try to bring back smb conf, that will work, but then,
active directory integtration does not work.

As I binded it to our active directory.

so can try using your AD-modified smb.conf file, but just make it owned by root:root?

**anony_alien** · 11-08-2012

Originally Posted by atreyu

Is it working on other DNS clients that are Linux hosts, or are they Windows hosts?

you have this in /etc/resolv.conf:

Code:

nameserver 192.168.1.254

I assume that is the ip address of the dnsmasq server?

so can try using your AD-modified smb.conf file, but just make it owned by root:root?

Correct, 192.168.1.254 is the dns server with dnsmasq.

I did change the smb.conf
to root:root ownership permissions

as follows:

Code:

sudo chown root smb.conf

sudo chgrp root smb.conf

Code:

ls -l 


-rw-r--r--. 1 root root    20 Jun 22 22:18 lmhosts
-rw-r--r--. 1 root root  2709 Oct 31 18:51 smb.conf
-rw-r--r--. 1 root root 10299 Oct 10 11:08 smb.conf.bak
-rw-r--r--. 1 root root  2780 Oct 26 13:49 smbconf.bak
-rw-r--r--. 1 root root    97 Jun 22 22:18 smbusers

Code:

getfacl smb.conf

# file: smb.conf
# owner: root
# group: root
user::rw-
group::r--
other::r--

Code:

sudo service smb start

Still no luck, it fails to start

Code:

Starting SMB services:                                     [FAILED]

cheers,

***atreyu*** · 11-08-2012

Re: DNS

1. what about your other DNS clients that you say are working: are any of them Linux?

2. do you have root on the dnsmasq server? i.e., can you check the config/logs?

Re: Samba

1. to be clear, is only the AD-modified smb.conf not working? When you've changed the permissions to root:root on the file, do the logs still report "unable to open configuration file"?

2. how about SELinux, is that on? Check with:

Code:

getenforce

**anony_alien** · 11-08-2012

thanks Atreyu for the reply,

1) Yes, there are linux clients, most ubuntu and gentoo clients.

2) SElinux is set to enforcing on:

'getenforce'

Code:


Enforcing

Could it be the problem, should I disable selinux?

2) Yes there is root on dnsmasq server

After I changed the permissions for smb.conf to root:root, permission denied is the same, I have a feeling that some of the lines probably in smb.conf
are not read properly or something and that is the reason.

the message on /var/log/samba/log.smbd:

Code:

[2012/11/08 17:06:40,  0] smbd/server.c:1141(main)
  smbd version 3.5.10-125.el6 started.
  Copyright Andrew Tridgell and the Samba Team 1992-2010
[2012/11/08 17:06:40.061792,  1] ../lib/util/params.c:513(OpenConfFile)
  params.c:OpenConfFile() - Unable to open configuration file "/etc/samba/smb.conf":
        Permission denied
[2012/11/08 17:06:40.062526,  0] smbd/server.c:1156(main)
  error opening config file

and on var/log/messages it says:

Code:

Nov  8 17:06:40 dataprobe-1 smbd[19656]: [2012/11/08 17:06:40.062526,  0] smbd/server.c:1156(main)
Nov  8 17:06:40 dataprobe-1 smbd[19656]:   error opening config file

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