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• Hardware firewall vs VMWare firewall appliance

  - by Luke

  We have a debate in our office going on whether it's necessary to get a hardware firewall or set up a virtual one on our VMWare cluster. Our environment consists of 3 server nodes (16 cores w/ 64 GB RAM each) over 2x 1 GB switches w/ an iSCSI shared storage array. Assuming that we would be dedicating resources to the VMWare appliances, would we have any benefit of choosing a hardware firewall over a virtual one? If we choose to use a hardware firewall, how would a dedicated server firewall w/ something like ClearOS compare to a Cisco firewall?

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• How to enable WMI Provider MSCluster on MS Server 2008 R2

  - by Tobias Hertkorn

  I have successfully set up a failover cluster on Microsoft Server 2008 R2 Enterprise Edition. Now I want to talk to the MSCluster WMI Provider on said server. WMI Queries to e.g. CIMV2 successed. But queries like select * from MSCluster_ResourceGroup where MSCluster_ResourceGroup.Name=\"testserver\" fail with "Access denied". I am using a domain admin account. Do I have to enable the MSCluster WMI Provider? What am I missing?

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• MediaWiki on MS Sql Server

  - by kdbolt70

  Hello all, I've been doing some digging on running mediawiki on sql server instead of mySQL, but haven't come across any concrete information. All of our servers are running SQL Server so I'd like to stick with that. I've tried Screwturn wiki, which is an ASP.NET wiki implementation using SQL Server, but I'm not terribly happy with the editing interface, and would really like to get MediaWiki up and running. Does anyone know if this is possible? Thanks!

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• Autossh dies after time

  - by Justin

  My setup is Ubuntu 10.04 on AWS Autossh to create a tunnel for MySQL The tunnel is automatically created using Upstart (/etc/init/autossh.conf): respawn console none start on (local-filesystems and net-device-up IFACE=eth0) stop on [!12345] script #user/IP Address redacted exec autossh -M 20000 -o StrictHostKeyChecking=no -L 3306:127.0.0.1:3306 [email protected] end script On boot the tunnel is created, works great. After some random idle time it dies. Any thoughts on how to keep it alive? I don't know what's killing autossh.

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• NFS caching on Ubuntu

  - by stream

  We run a bunch of ubuntu servers (mostly 8.04 LTS) which all mount an nfs share at /nfs. We use the nfs primarily for two purposes: symlinking config files (such as apache vhosts) reading & writing uploaded files This all works great except it makes us fully dependent on the central NFS server (which is a DRBD cluster with heartbeat failover from primary to secondary, but we've still seen issues). What we'd like is if we could mount the NFS through some local caching layer which would make any file which had previously been read remain available even if /nfs isn't. Writes could be disabled for this period. Searching around it looks like cachefilesd may be an option. Unfortunately, it's only packaged for ubuntu 9.10 & 10.04 it looks like. I was also looking for a FUSE-based solution which might fit the bill, but hadn't found anything yet. Any suggestions would be greatly appreciated!

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• Backing up Information Store - Recovering to Different Information Store / RSG

  - by Kip

  Hi All, I have a question on a situation, that hasn't yet arrisen but I wondered the possibilities and how we go about it. Currently we backup our Exchange 2003 Cluster with Backup exec. Currently it is set to backup the Microsoft Information Store on that server and all of the Mailbox Stores beneath it. We have previously used this in conjunction with a recovery storage group on the same server to recover lost mailboxes. However, due to space constrictions on that server ( a seperate issue that is being addressed in the very near future but outside of the scope of this question) we now don't have enough space on that server to do a recovery storage group type restore. Is it possible, to restore an information store, to a different server in the same administrative group (ie first)? By that I mean we have the following: Server1 | First Storage Group | Mailbox Store1/2/3 Could Mailbox Store 1 be restored to: Server2 | First Storage Group | Recovery Storage Group Both servers are under the same Administrative Group Currently for whatever reason ( mainly time) the mailboxes are not being backed up individually. Regards Kip

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• What happens when the USB key or SD card I've installed VMware ESXi on fails?

  - by ewwhite

  An SD (SDHC) card installed in an HP ProLiant DL380p Gen8 server running VMware ESXi just failed. I encountered some rather ominous looking messages on the vCenter console and in the HP ProLiant ILO event log... Lost connectivity to the device ... backing the boot filesystem. As a result, host configuration changes will not be saved to persistent storage. Embedded Flash/SD-CARD: Error writing media 0, physical block 848880: Stack Exception. VMware advocates the use of USB and SD (SDHC) boot devices for ESXi. It was one of the main reasons the smaller footprint ESXi was developed (versus the older ESX). I've spent much time highlighting the differences between ESXi's installable and embedded modes to coworkers and clients. However, these failures do seem to happen. In this case, this is my third instance. Luckily, this is a vSphere cluster with SAN storage. What steps should be taken to remediate this failure?

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• XAMPP with PostgreSQL

  - by fred smith

  I'm looking for a package like XAMPP, but instead of MySQL it would use PostgreSQL. I've done some searching and haven't turned up anything other than doing a full server setup of both.

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• Connection lost to iscsi san after problem with san

  - by marceldejager

  Hi there, We have a cluster running with 3 VSpere ESX4 server that all are connected to a lefthand san through iSCSI. This all worked well but a week ago there was a problem with the san. After fixing that problem the VMWARE server continued working but this weekend I saw that 1 server didn't have a connection with the SAN. The other two work perfecly. I looked at all setting and I cannot find a problem. Nowhere I can't find any erros. Has anybode a idea? Thanks, Marcel

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• NetApp and SQL Server?

  - by Edinor

  Do you have any good or bad experiences to share running SQL Server OLTP Systems on NetApp appliances? I have been working with a small, relatively low-volume cluster with a lower-end NetApp device, and I have found the environment to be generally unstable, at least compared to my experiences with other SANs, iSCSI arrays, and DAS setups. I struggle to believe that RAID DP and WAFL are more than fairy-dust technologies. A solution has been proposed to me that I just need a bigger, better NetApp, with PAM cards and other cool technology I've not heard of, and I feel like I would be better off spending a quarter of that on good direct-attached drives and a beefy server. At the same time, I feel that an Enterprise-class SAN should be something I can count on to be consistently a more stable, better performer than the less expensive solution I might propose. Are you a SQL Server DBA in an OLTP environment and love your NetApp? If you don't like them, why not?

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• Can't access server running CentOS 6.3 in vmware

  - by localhost

  I just installed CentOS on a vmware machine that uses a bridged connection, installed apache, php and mysql, but when I run service httpd start I get a warning(?): Starting httpd: httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain for ServerName I can connect to the server using putty, so I really have no idea why it won't load in the browser. EDIT: Httpd starts successfully, return [ OK ]. Running netstat -tuplen | grep :80 yields: tcp 0 0 :::80 :::* LISTEN 0 40392 15894/httpd I am able to connect with putty to 192.168.0.113, but browser says can't connect to 192.168.0.113

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• mysqldump on console, how to escape password?

  - by psynnott

  Hello, I am running a mysqldump via a bash script and have encountered a problem with a password that contains special characters. How do I escape the password? mysqldump -hlocalhost -uUSERNAME -pPA$$W0RD DATABASE | gzip /home/USERNAME/backups-mysql/BACKUP.gz

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• NLB 2 Windows Server 2003 Servers

  - by Paul Hinett

  I need to configure windows NLB on 2 dedicated servers I have. My main machine has been running for some time, with several domain names pointing to the servers primary IP address. Both servers have 2 NIC's installed, and both have several secondary public IP addresses available if needed? What IP address would I use for the cluster IP, does this IP need to be added to the IP list of both public NIC's ip address list? What IP addresses do I use for the host's dedicated IP? Please help, this is driving me nuts...i've taken down the server twice on accident today! Thank you in advance!

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• Exchange 2007 CCR: Logs not replicating to passive node partition

  - by yum_tacos4u

  In my environment I have setup Exchange 2007 in an CCR cluster, mirroring our main servers to a set of servers in passive mode. One of the partitions on the passive node that I have setup for the logs for Exchange 2007 has faulted, causing the partition to be unreadable. I have replaced the partition on the passive node, and setup the drive to mirror the one in active mode, but the logs are not replicating since the change. Is there anyway to force the replication of the new drive for the logs to the new partition? Any idea why the logs are not replicating? Any help or comments is appreciated, and thanks in advance.

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• How can I expire non-active sessions on my Netscreen SSG140?

  - by David Mackintosh

  I have a Juniper Netscreen SSG-140. While experimenting with a VoIP service, I defined a custom policy that was to be used to permit the possible ports in use to be sent back to the VoIP server from systems connecting across the internet. Because I'd had problems in the past with VoIP systems getting broken when their UDP sessions were expired out faster than their keep-alives were generated, I set the timeout on this custom service to be 'never'. After much experimentation, I happened to notice that my session count on the firewall has grown from a couple thousand to over 36000. After discussion with the VoIP "expert", I set the timeout to be 30 minutes; however, all the sessions set up during the experimentation process are still there, more than 3 days later. Is there a way I can force these old sessions to get expired and removed from the session table, or am I looking at resetting my firewall? (Both firewalls, actually -- they are in a cluster.)

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• Windows FAT/NTFS Low-Level Disk Viewer (Norton DiskEdit alternative)

  - by Synetech inc.

  Hi, One of my most valuable software tools has always been Norton DiskEdit from Norton Utilities/Symantec Systemworks. I have used it for years for so many things, including, but not limited to learning file-systems. I am now in search of a similar tool that can let me view FAT and NTFS disks at a low and high level under Windows. I have seen Runtime Software’s DiskExplorer, but unfortunately, it is limited in a number of ways, particularly annoying is that it does not really let you view the disk as structured (it does not let you see directory entries from a directory that is fragmented like DiskEdit can without doing a too-exhaustive scan which doesn’t even work for FAT partitions that have cluster sizes <4KB). Does anyone know of a Windows alternative of a Norton DiskEditor? Thanks a lot.

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• Citrix XenServer iSCSI shared disk?

  - by chsguy

  I am running Citrix XenServer Essentials 5.5, with VMs stored on an EqualLogic iSCSI shelf, using XenServer's StorageLink. I would like to create a "virtual disk" that can be attached to multiple VMs. This would be used for a cluster file system like OCFS2 or GFS. This doesn't seem possible using the XenCenter GUI and I can't find anything online about how to do it. I realize I could simply expose the iSCSI network to the VM and have the VM initiate its own iSCSI, but that creates a lot of security challenges. This was pretty easy to do on Oracle VM Server, which is Xen based, so I know it's not a limitation of Xen itself. Maybe there is an "xe-" command for this? Thanks for any suggestions you can provide.

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• Most common account names used in ssh brute force attacks

  - by Charles Stewart

  Does anyone maintain lists of the most frequently guessed account names that are used by attackers brute-forcing ssh? For your amusement, from my main server's logs over the last month (43 313 failed ssh attempts), with root not getting as far as sshd: cas@txtproof:~$ grep -e sshd /var/log/auth* | awk ' { print $8 }' | sort | uniq -c | sort | tail -n 13 32 administrator 32 stephen 34 administration 34 sales 34 user 35 matt 35 postgres 38 mysql 42 oracle 44 guest 86 test 90 admin 16513 checking

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• Sun Grid Engine: Automatically Terminating Idle Interactive Jobs

  - by dmcer

  We're considering using Sun Grid Engine on a small compute cluster. Right now, the current set up is pretty crude and just involves having people ssh to an open machine to run their jobs. We'd like to allow interactive jobs, since that should ease the transition from manually starting jobs to starting them using qsub. But, there is some concern that, if we do, people might accidentally leave their interactive sessions idle and block other jobs from being run on the machines. The issue isn't just theoretical, since we previously tried using OpenPBS and there was a problem with people opening up an interactive job in a screen session and essentially camping on a machine. Is there anyway to configure SGE to automatically kill idle interactive jobs? It looks like this was requested as an enhancement (Issue #:2447) way back in 2007. But, it doesn't seem like the request ever got implemented.

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• Find and free disk space that is unused but unavailable (due to file system error, etc.)

  - by Voyagerfan5761

  Sometimes I get the feeling that if an app such as μTorrent allocates files on my FAT32-formatted flash drive, but then is killed or crashes (as happens more than a few times a month), that space just disappears from my file system. Whether or not that is the case, sometimes I do get a chill from wondering if I've lost hundreds of MB in available storage due to carelessness or malfunctions. Checking my disk with WinDirStat just makes it worse, because I see the huge "<Unknown>" item at the disk root staring at me, eating up well over a gigabyte. It might be FS inefficiency (due to 32 or 64kb sector/cluster size and a lot of tiny files) or it might be a glitch... Is there a tool I can download and run to check my file system and make sure that there aren't any unused allocated blocks on the disk? I want to make sure I'm not losing any disk space to I/O errors, etc.

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• What's the difference between keepalived and corosync, others?

  - by Matt

  I'm building a failover firewall for a server cluster and started looking at the various options. I'm more familiar with carp on freebsd, but need to use linux for this project. Searching google has produced several different projects, but no clear information about features they provide . CARP gave virtual interfaces that failover, I am not really clear on whether that's what corosync does, or is that what pacemaker does? On the other hand I did get manage to get keepalived working. However, I noted that corosync provides native support for infiniband. This would be useful for me. Perhaps someone could shed some light on the differences between: corosync keepalive pacemaker heartbeat Which product would be the best fit for router failover?

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• How to create ftp server on Webmin?

  - by Tom

  Hello firstly, i'm new at vps hosting so i'm not that good at SSH and so on, So i have a vps running centOS 5.4 x64 LAMP ( linux,apache,mysql,php) and i'm really confused because i can't find FTP management or subdomains or even the email address on my webmin panel. Should i install additional modules ? Thanks

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• HP DL580 G5 Hyper-V networking problem

  - by mr-perfect

  Hi I have installed the hyper-v role on a DL580 G5 cluster. The host operating system is a server 2008 x64 patched to the maximum. Everything has gone fine, but if I install a guest operating system, actually a windows server 2008 x64 I can't reach the network from it. It send many packets, but don't received any, so I can't ping the external network as well. I have installed the latest drivers to the server and unintalled the network configuration utility from the physical server, but no luck. I added a legacy adapter to the guest binded to the same phisycal adapter on the host machine but it can't help Any idea welcome...

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• Snmpd update interface counters slowly or something like this

  - by Korjavin Ivan

  I update one my freebsd box to 9-stable (totally new installation) and install net-snmp for monitoring. uname -r 9.1-PRERELEASE pkg_info net-snmp-5.7.1_7 Information for net-snmp-5.7.1_7: Comment: An extendable SNMP implementation .... cat /var/db/ports/net-snmp/options # This file is auto-generated by 'make config'. # Options for net-snmp-5.7.1_7 _OPTIONS_READ=net-snmp-5.7.1_7 _FILE_COMPLETE_OPTIONS_LIST= IPV6 MFD_REWRITES PERL PERL_EMBEDDED PYTHON DUMMY TKMIB DMALLOC MYSQL AX_SOCKONLY UNPRIVILEGED OPTIONS_FILE_UNSET+=IPV6 OPTIONS_FILE_UNSET+=MFD_REWRITES OPTIONS_FILE_SET+=PERL OPTIONS_FILE_SET+=PERL_EMBEDDED OPTIONS_FILE_UNSET+=PYTHON OPTIONS_FILE_SET+=DUMMY OPTIONS_FILE_UNSET+=TKMIB OPTIONS_FILE_SET+=DMALLOC OPTIONS_FILE_UNSET+=MYSQL OPTIONS_FILE_UNSET+=AX_SOCKONLY OPTIONS_FILE_UNSET+=UNPRIVILEGED I have about 500 vlan on this machine, and collect info about interface through snmpd to 2 different software, zabbix and cacti. And both of them plot the graphs with blank fields. I tryed change polling time in zabbix, from 15, sec to 30,60,90,120,10. And anyway i have blank fields. snmpd.conf is empty - only a access controls. This configuration worked fine on freebsd 8. Where is my fault? How fix this graphs? UPD: Changing pooling time, switch off one of agent, doesnt help. I look at zabbix log (recieved data from snmpd) and see that: sorry for russian locale, just look at numbers: and thats is not true, as my "iftop" show speed was about 90Mbits, but snmpd return 2Mbits. I understand that snmpd doesnt return speed, it return just a counter. But how its possible? why 2Mbit/s ? I tryed recompile snmpd with 64-bit counters, and without it. In both variants this blank fields present. So i think its my OS (freebsd) doesnt update interface counters well. I still collect tcpdump for found this request/response. But have problem with that, to much trash. UPD2: I decrypt tcpdump-ed file, and public this as google doc at gdocfile Timediff looks strange.. Like zabbix sometimes "forget" do request, and then do twice at row, ehh UPD3: I parse log from command "while true; do netstat -bin -I vlan4008 /var/log/netstat; sleep 300; done" and load as google docs, and add formula for speed : link Looks like all counters in OS are good. Now i think problem in : 1. zabbix get request twice at row (and what about cacti) 2. snmpd use counter32

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• m23 vs webmin vs landscape vs whatever you can propose, I need software to mantain a bunch of debian

  - by marc.riera

  Hello, I know there is landscape from canonical, but it has some $$ costs. Als there is webmin, and it can be used as a cluster management tool. Also there is m23, probably the most usable and interesting peace of manager software. But, what would you suggest to install and use on following configuration: 1) 100 desktop users, against an AD with quest authentication services installed. (ubunt8.04,9.04,9.10,10.04) 2) 50 servers (debian sid, lenny , ubuntu 8.04 and 10.04) We work on different software, so each group of persons need different configurations, each server has different pourposses, nothing is clusterized. And we have a good enough backup software. So , my objectives are: - easy install (deploy) - good reporting - easy logonscripts for users - easy bootupscripts for servers Thanks all for reading, and more thanks for your time. Marc

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