## 2009/12/22

### Exchange PowerShell tips

Add Full Mailbox permissions to all mailboxes in the exchange organization:
# Matt’s Powershell Script (see tigermatt.wordpress.com) to add Full Mailbox permissions to all mailboxes in the Exchange organization
$userAccounts = get-mailbox -resultsize unlimited ForEach ($user in $userAccounts) { add-MailboxPermission -identity$user -user “your-admin-account-name” -AccessRights FullAccess
}

Delete all messages in specific users' mailboxes with a specific title:
#$userAccounts = get-mailbox -resultsize unlimited ForEach ($user in "John Doe", "Jane Doe", "Humpty Dumpty")
{
get-Mailbox -Identity $user | Export-Mailbox -SubjectKeywords "This is the message subject" –DeleteContent –MaxThreads 10 } Delete all messages in an Exchange organization with a specific title: Add-PSSnapin Microsoft.Exchange.Management.Powershell.Admin -erroraction silentlyContinue$userAccounts = get-mailbox -resultsize unlimited
ForEach ($user in$userAccounts)
{
Export-Mailbox -Identity $user-SubjectKeywords "This is the message subject" –DeleteContent –MaxThreads 10 } ## 2009/11/21 ### PowerShell examples ping an ip address range and report which hosts are down: PS H:\> for ($i=200; $i -lt 255;$i++ ) { ping -n 1 -a -w 1000 192.168.0.$i >$null; if (!$?) { echo "192.168.0.$i is
down" }; }

Send an email with attachments (like logs), quick and dirty:
send-mailmessage -to me@foo.com -Subject "see attachment" -from myhost@foo.com -attachments "C:\bar.log" -smtpserver mail.foo.com

## 2009/11/17

! If telnet is configured and enabled, then telnet to the router; else connect to the serial port(I use putty for both)myrouter> enablemyrouter# config terminalmyrouter(config)# password encryption aesmyrouter(config)# service password-encryption! assign a domain name; this is a prerequisite for ssh key generationmyrouter(config)# ip domain-name mydomain.com! initialize the authentication, authorization and accounting policymyrouter(config)# aaa new-model! configure the authentication source; in this case we'll use a local dbmyrouter(config)# aaa authentication login default local! configure the authorization source; the aaa policy is called "default"myrouter(config)# aaa authorization exec default local! create a user, assign a low privilege level (so enable password is still needed) and passwordmyrouter(config)# username my-username password my-password! apply the policy to the vtymyrouter(config)# line vty 0 4myrouter(config-line)# login authentication defaultmyrouter(config)#! Enable SSHv2 only (disables SSHv1)myrouter(config)# ip ssh version 2myrouter(config)# crypto key generate rsa general-keys modulus 1024! After verifying that ssh works, do this:! Enable SSH only on virtual terminals (disables telnet)myrouter(config)# line vty 0 4myrouter(config-line)# transport input ssh! add this to the ACL for your wan interfacepermit tcp any host (router-external-ip) eq (some-high-range-port)! Add this nat to open external access to ssh at the high-range portip nat inside source static tcp (router-internal-ip) 22 interface FastEthernet0 (the same-high-range-port)How to copy router config to ssh server with scp:enablecopy run scp://my-usename:my-password@backuphostname//path/to/folder/$h-$tarchivepath scp://my-usename:my-password@backuphostname//path/to/folder/$h-config! the write memory option will cause the archive scheduler to create a copy of the config eachtime it's saved to nvram. (it will append an incrementing -# to the end)write-memoryend(note that you may need the 'file prompt quiet' command to stop it from prompting whether you want to do it.)# now compare two configs:show archive config diff system:running-configscp://my-usename:my-password@backuphostname//path/to/folder/router-config-1# now replace the running config with an archived one:config replace scp://my-usename:my-password@backuphostname//path/to/folder/router-config-1 list# now log all config changes to syslog:config tarchivelog configlogging enable! suppress display of passwords in configuration logshidekeys! enable sending of notifications of configuration changes to syslognotify syslogexit#The ‘do’ command allows you to run exec level commands from config mode.Examples:Router(config)#do show run# Enable syslog logging my-router(config)# logging (my-syslog-server-ip)! The level "notifications" will include emergencies(0), alerts(1), critical(2), errors(3), warnings(4), and notifications(5); but it will exclude informational(6) and debugging(7)my-router(config)# logging trap notifications# optionally specify on what interface the logging should originatemy-router(config)# logging source-interface f0/0 ## 2009/11/13 ### LDAP search to get active accounts with no password expiration To get user account names of all *active* Active Directory *user* accounts with passwords that do not expire, run this command on Linux (substitute your domain, your admin account, and your domain controller): ldapsearch -b "dc=mydomain,dc=com" -D "cn=myAdminAccount,ou=Users,dc=mydomain,dc=com" -H ldap://mydomaincontroller/ -W -x '(&(objectclass=User)(userAccountControl:1.2.840.113556.1.4.803:=65536)(!(userAccountControl:1.2.840.113556.1.4.803:=2))(!(objectclass=Computer)))' sAMAccountName | egrep "^#" The "1.2.840.113556.1.4.803" is the ldap code for a bitwise compare, and 65536 (decimal) is 0x10000 (hex), which refers to the bit that identifies whether a password will expire. (if "on", password will not expire.) "2" refers to the bit that identifies whether an account is enabled or not. ## 2009/10/02 ### iSCSI initiator on CentOS 5 yum install iscsi-initiator-utils vi /etc/iscsi/initiatorname.iscsi vi /etc/iscsi/iscsid.conf # In particular, if using authentication: node.session.auth.username = ISCSI_USER_NAME node.session.auth.password = Password discovery.sendtargets.auth.username = ISCSI_USER_NAME discovery.sendtargets.auth.password = Password chkconfig iscsi on service iscsi start iscsiadm --mode discovery --type sendtargets --portal or iscsiadm --mode node --targetname --portal :3260 --login service iscsi restart chkconfig iscsid on service iscsid start Now the device nodes should be present fdisk, do whatever, and in /etc/fstab, your entry should look something like this: /dev/sdb1 /mnt/foo ext3 _netdev 0 0 Note that if you want to use lvm, you should ensure that the iscsi devices are on separate volume groups from your root and system filesystems; else, the system may be non-bootable if the iSCSI targets cannot be reached. ## 2009/07/09 ### Parallelizing Tasks in Unix/Linux From Ian C. Blenke, The easiest way is with parallelized xargs:$ find . -name '*.jpg' | sed -e 's/.jpg$//' | xargs -P4 -l1 -i convert {}.jpg {}.png The -P flag for xargs is a _wonderful_ thing to learn. Do it now, it will forever save you time. I use it daily in our huge farm of linux servers, makes for far more bearable adminning. ## 2009/06/08 ### CentOS NFS permission denied on mount NFS mount results in a permission denied error. Check the export permissions, and those are right. The solution is to add (on the exporting host): nfsd /proc/fs/nfsd nfsd auto,defaults 0 0 to /etc/fstab and then type:$mount -a

on the client.

not sure why this error exists.

## 2009/05/20

### Remote execution on Windows

I've been trying to have a poor man's backup: from my scsi-tape-attached linux box, remote execute ntbackup on each of my windows boxes, then dump those backups to tape.

In the past, I've had separate scheduled tasks on each windows server; the problem is, there's not central error reporting mechanism; the idea of the new approach is to have all of the backup reporting (and exit statuses) in one cron log report.

I've been using winexe, which is pretty cool. It lets you run remote windows commands from Linux. It appears to be part of Samba4, although you don't need all of Samba4 to make it work.

...It hasn't worked properly.

appears to say why:
'Any process you can access or create on a remote machine will not be able to "touch" any other machine in the network. Only an "interactive" session can do this by default.
'You would need to tell Active Directory to "Trust" the machine for "Delegation" to make this work. This is usually not a good idea as it can present a considerable security risk if not managed closely.'
If true, then that might have something to do with it.

...the selection lists, the backup scripts, and the backup targets are located on a linux samba server. Then again, it appears to be able to see and execute those files. Hmm... too tired, need to think about this more.

## 2009/05/19

### OpenSolaris Notes

I'm primarily a linux guy (used Solaris between 96-2002), so here are some notes to self:

Service log files are stored under /var/svc/log

There are a few problems getting printing to work in 2009.06:
http://defect.opensolaris.org/bz/show_bug.cgi?id=2656
http://defect.opensolaris.org/bz/show_bug.cgi?id=6366

patch /etc/dbus-1/system.d/hal.conf

pkg install SUNWsmmgr
svcadm refresh svc:/system/dbus:defaultsvcadm restart svc:/system/dbus:defaultsvcadm disable snmpsvcadm enable snmpsvcadm clear printers:snmpsvcs printers:snmp
tail -f /var/svc/log/*print* to see what's happening.

## 2009/05/16

### Centos AD Authentication and users and groups

To configure your linux workstation to pull user and group, and authentication information, from AD, run these commands. They do the dirty work of configuring pam, samba+winbind, nscd, and Kerberos.

yum install samba pam_krb5.x86_64 pam_smb.x86_64 nscd

authconfig --enableshadow --passalgo=sha512 --disablenis --disableldap --disableldapauth --disableldaptls --disablesmartcard --disablerequiresmartcard --enablekrb5 --krb5kdc=dc1.domainname.com --krb5adminserver=dc1.domainname.com --krb5realm=DOMAINNAME.COM --enablekrb5kdcdns --enablekrb5realmdns --disablesmbauth --smbworkgroup=DOMAINNAME --smbservers=dc1.domainname.com,dc2.domainname.com --enablewinbind --disablewinbindauth --smbsecurity=ads --smbrealm=DOMAINNAME.COM --smbidmapuid=10000000-20000000 --smbidmapgid=10000000-20000000 --winbindseparator=\\ --winbindtemplatehomedir=/home/%D/%U --winbindtemplateshell=/bin/bash --enablewinbindusedefaultdomain --enablewinbindoffline --winbindjoin=admin-username --disablewins --disablehesiod --enablecache --enablelocauthorize --enablepamaccess --disablesysnetauth --enablemkhomedir --updateall

Note that all users on the domain will now be able to log in to your computer over the network, unless you either:

1. Set up a ssh AllowUsers or AllowGroups parameter in /etc/ssh/sshd_config (see man page for sshd_config); or

2. 2. Use pam_access (see man page for pam_access)

## 2009/05/12

### XenServer VM won't shutdown

I had a windows x64 vm domU that was locked up. It would not shut down through XenCenter. It would not shut down through the command line with "xe vm-shutdown vm=" or "xe vm-shutdown --force vm=".

In the logs were these mesages:
VM.hard_shutdown R:82ca53505e13|xapi] VM.hard_shutdown locking failed: caught transient failure OTHER_OPERATION_IN_PROGRESS: [ VM; OpaqueRef:6c1f16b5-7a80-c3fa-eb07-6b605d1fa305 ]
[20090512 08:43:59.181|debug|vserve0|166 unix-RPC|VM.hard_shutdown R:82ca53505e13|xapi] Waiting for 12.745108 seconds before retrying...

I could not find any information on what "OTHER_OPERATION_IN_PROGRESS" meant (other than the obvious), or how to address it.

A host reboot also did not work: the xen host would not shut down gracefully, because it could not terminate this vm -- it would just hang at "terminating remaining VM's".

Finally, too late, I found the answer in the Citrix forums:

To know the cause of the rejection, you can try running xe task-list and see if anything is in pending state that might be related to the command failure.

If you do see anything that is likely to be in the way, try removing the task with xe task-cancel uuid= TASK-UUID, then try the shutdown operation again.

You may have to do a
xe-toolstack-restart.

## 2009/05/04

### Samba and SELinux

In a previous post, I mentioned that you can keep selinux enabled to keep your system a bit more secure, by applying a label to your system.  For example, with a Samba share, you might do this:

chcon -R -t samba_share_t /srv/exports/backups

This labels (recursively) the /srv/exports/backups share as a samba share.

But this change wont persist across a filesystem relabel.  So, we have to do this:

semanage fcontext -a -t samba_share_t ’/srv/exports/backups(/.*)?’
restorecon -R -v /srv/exports/backups

For more tips and more options, see http://danwalsh.livejournal.com/14195.html .

## 2009/02/11

### Sun xVM Server evaluation

The following is a letter I sent after evaluating Sun xVM Server Early Access 3. After EA3, there should be an EA4, and then, I'm told, there will be the General Availability. Letter follows:

First, let me say, I really appreciate the decent customer service at the beginning of this engagement, both from my reseller and from Sun. It was a little painful to actually get the software to download, but my many questions were answered well to my satisfaction.

I like Xen. I like Sun because of history. I think Sun Xen (xVM) offers an easy migration path for my existing RHEL 5 Xen infrastructure. I like the Microsoft support of Sux xVM. But I haven’t used Solaris seriously in 8 years, so I know I won’t be able to do the kind of under-the-hood troubleshooting that I routinely do on linux-based systems. It’s an uphill battle getting Sun hardware and software, though, because other folks here are much more comfortable with, for example, HP and VMware. That said, we’re in a growth mode, moving to virtualize a lot of stuff this year, buying hardware and possibly software for virtualization.

While I expected some occasional glitches in xVM server, perhaps even panics, etc., I have really been left feeling that this EA3 is not a Beta, RC1, or RC2 type product, but really an alpha-level development snapshot.

It would not recognize the RAID in my HP server. Okay, so I can’t run it on any of my HP servers, and won’t be able to do so in the GA.

…the install cd panics on my HP xw8600 workstation. In fact, of the OpenSolaris releases, 2008.05 works, but 2008.11 panics (and an upgrade from 2008.05 to 2008.11 also results in a non-bootable, panicky, system). The panics happen in several different modules, but appears to be related to the Intel SATA chipset. After spending wasting many hours getting it working, I was able to mask out the proper devices in the BIOS, and get xVM server to install. The Hardware Compatibility List is apparently wrong about my particular workstation.

Finally, having it installed, the web UI is painfully slow on my quad-core, 10GB RAM workstation.

Some web UI features don’t work, because they use flash, and flash isn’t distributed with xVM. Okay, I’ll just look at the charts from a remote box.

Wait, the box isn’t on the network. DHCP didn’t work. (tried both NICs). I assigned a static IP. Still no-go. No console diagnostics, apparently, to try to ping a gateway, see NIC state (UP, RUNNING, counters, etc.), or further troubleshoot my problem. *sigh*. I guess I also can’t try the registration feature, the “update” feature, or access the flashy graphs from another system; nor can I import an iso nor create a library on my nfs server.

Okay, so I’ll play around with the other features.

Hmm…, I can’t see how to set up raid-Z in the storage part of the management console. I was hoping to do things like stripe the main test volume disks, but replicate snapshots to a separate internal disk, then to a remote zfs target. No luck there.

No nic teaming nor vlan trunks seems like a glaring omission for a virtualization platform (no redundant network paths?!! No bandwidth aggregation / load balancing?). I knew this from the Q&A at the beginning of the eval, but it’s still alarming that this feature set would be absent in a modern server product distribution.

Basically, I expected 80-90% functionality. I figure that I’ve gotten a pretty (slow) UI, with 20% functionality under the hood. Blame a lot of it on the hardware, but, come on, Intel SATA chipset, HP workstation, and Broadcom NICs?? Can’t you support that?

I can’t imagine that the GA will be that great, if this pre-release is this bad, and release is scheduled (slipped) for Q2CY2009. Maybe in a year. But then, only if Sun is showing true market leadership and profitability in at least some major area, and demonstrates that it can “not just survive, but thrive”.

Yes, I’m frustrated because I’ve spent time I didn’t have, evaluating a product that didn’t work (not even to beta levels); even though I was a “believer” going in to the experience, trying to give it every chance I could, I call this eval a failure.

Can I try to run my own opensolaris Xen solution? Well, my trial of opensolaris has been less than stellar (panics on install).

Thank you for the opportunity to look at this product. I’ll give EA4 exactly one chance, but I won’t waste any more time trying to troubleshoot stuff that should just work.

P.S. I’d have a Sun workstation, but the HP gave me more, at a much lower cost than the Sun model.

## 2009/01/19

### OpenSolaris Review, Troubleshooting Tips

Trying to install OpenSolaris 2008.11 on my HP Pavillion xw8600 workstation. It's certified for solaris 10, but apparently not OpenSolaris? Has the caveat that the SATA controller must use PATA emulation as noted on the certification link.

Successfully installed 2008.5, then upgraded to latest; reboot after upgrade makes the system panic on reboot.

No luck so far with 2008.11. Kernel panics galore. Have tried passing various versions of these options to the kernel, with no luck:

disable-uhci=true (disable usb)
disable-ehci=true (made this one up, disable usb 2.0?)
acpi-user-options=2 (disable acpi, see this )
acpi-user-options=8 (run acpi in legacy mode)
use_mp=0 (disable cpu cores other than core 0)
ata-dma-enabled=0

To use the above options, modify the grub kernel line. To do that, boot the system from the cd. When the grub menu is displayed, press a key to stop the countdown. Then press "e" and "e" again to edit the kernel line of the default boot option. Append "-B" followed by a space and a comma-separated list of the above parameters. Then press "ENTER" and "b" to boot it.

To boot into single-user mode, add "-s" to the end of the kernel line.
To enable verbose output during boot (and learn what's going on), add "-v" to the end of the kernel line.
To enable verbose output from SMF ("Service Management Facility") as your services start, add "-m verbose" to the end of the kernel line.

Debugger tips
To enter the debugger, add "-kdv" to the end of the kernel line
use_mp/W 0 :c (to disable multi-processor)
moddebug/W 80000000 (to print debug info from each module that loads)
:c - continue boot (or reboot if it's panicked)
\$C prints a stack backtrace.
::msgbuf - print the console messages
::status - the state of the machine
::stack - print the stack
::modinfo - display info on loaded modules
::findstack

example for how to debug a core file: mdb -k unix.0 vmcore.0
::panicinfo

Network Configuration
edit nwam config
vi /etc/nwam/llp
disable nwam (network automagic configurer)
enable default network config-ability

see if the network interface device driver is installed by doing ifconfig -a -- you should see some interfaces other than lo0
If it's not loaded, then do "ifconfig bge0 plumb" to enable the module, where bge0 is replaced by the correct device name for your driver.

Once it's loaded, you can do
ifconfig bge0 dhcp
to configure the interface for dhcp, or
ifconfig bge0 /
ifconfig bge0 up
default router config file: /etc/defaultrouter
...then, edit /etc/resolv.conf to list your dns servers, e.g.
nameserver 10.0.0.5
nameserver 10.0.0.6
edit /etc/hostname. to set the hostname, or sys-unconfig

Working with Services
svcs -a (list all services and states)

Package Management Tips
see http://opensolaris.org/os/project/pkg/
find a package, e.g.:
pkg search java
install a package
pkg install
e.g.,
pfexec pkg install SUNWjre-config-plugin