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  • Using MRTG's threshold feature to execute a php script

    - by Dan Fried
    I've set up mrtg using the online manual and the only online tutorial I found on the subject of thresholds, and the threshold just isn't firing. In my mrtg.cfg file, the relevant lines are ThreshDir: /path/to/mrtg/thresh ThreshMaxI[performance]: 1 ThreshMaxO[performance]: 1 ThreshProgI[performance]: /path/to/mrtg/scripts/alert.php ThreshProgO[performance]: /path/to/mrtg/scripts/alert.php The paths are right, because if I enter the paths wrong I get an error on executing mrtg. websitePerformance checks how long it takes to download the homepage, in milliseconds, so it should be exceeding the max every time. Alert.php is working fine when invoked directly from the shell, and when I point to a nonexistent script it tells me the script is not executable. No error messages are being generated, that I can find. The thresh directory is always empty. Why isn't the threshold being triggered by results that are greater than 1? Anyone have any suggestions?

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  • Remote paging with Nagios when network is down and email won't work -- cellular modems and alternatives

    - by Quinten
    What is the best option for remote paging when network services are down? I'm looking for a solution that can let me know when network services are down during off-hours only, and especially when email/smtp services are out. Therefore, it needs to be redundant to our network and power supply. I'm imagining a cellular modem is one option. What's the price range for these? Is anybody using them and feel that they are worth the cost? I'm imagining that it's something we would end up sending an emergency page ~ 1x/month at most, so I'd like the pricing to reflect that--I don't mind a high per-page cost as long as it has a low recurring cost. Another option would be to expose at least one server to remote ping, and run a check script on a remote server. Are there paid options for this? Currently, we run Nagios on a Linux VM on a Windows 2008 Hyper-V host. It would be great if the solution would work in that environment, but I know it's tricky with external devices, and we could move Nagios to a standalone workstation if needed.

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  • Can I customize the Summary Network Report in Windows Server 2008?

    - by Xavier
    Hi Guys, We get a weekly Summary Network Report from our SBS 2008 server, delivered by email. The report contains many alerts. We want to ignore some of them so that the report is all green and any alert will stand out. For example, we want to ignore the alert regarding the firewall being off on the server. Is there a place where I can select what points to check and the level of some alerts (such as low remaining disk space), etc?

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  • Determine who is opening a .PST file from a network drive on the local network?

    - by hypoxide
    Our system admin has been struggling with the issue of our network getting completely locked up when users open PST files from network drives. Apparently Microsoft is aware of this problem but there is no fix for it. The entire local network is unable to use Outlook while this file is being opened (which may take hours). Is there a way to determine which user is opening the file instead of forcing everyone in the office to close outlook (like a traffic monitor or something)?

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  • NTOP gives warnings on startup

    - by FR6
    I just installed ntop 1.4.4 and when I start it, it give me infinite warnings "packet truncated": ... RRD_DEBUG: umask 0066 RRD_DEBUG: DirPerms 0700 THREADMGMT: RRD: Started thread (t2992630672) for data collection THREADMGMT[t2992630672]: RRD: Data collection thread starting [p30923] INIT: Created pid file (/var/run/ntop.pid) THREADMGMT[t3086329552]: ntop RUNSTATE: INITNONROOT(3) Now running as requested user 'nobody' (99:99) Note: Reporting device initally set to 0 [eth0] (merged) THREADMGMT[t3086329552]: ntop RUNSTATE: RUN(4) THREADMGMT[t2982140816]: NPS(1): Started thread for network packet sniffing [eth0] THREADMGMT[t2982140816]: NPS(eth0): pcapDispatch thread starting [p30923] THREADMGMT[t2982140816]: NPS(eth0): pcapDispatch thread running [p30923] THREADMGMT[t3047009168]: SIH: Idle host scan thread running [p30923] THREADMGMT[t3057499024]: SFP: Fingerprint scan thread running [p30923] **WARNING** packet truncated (8814->8232) **WARNING** packet truncated (10274->8232) **WARNING** packet truncated (8814->8232) **WARNING** packet truncated (8814->8232) ... Do I need to configure something? I tried to access the web interface (http://localhost:3000) but it does not work. Note: I'm on CentOS. EDIT: Not sure if it helps but there is my "ifconfig": eth0 Link encap:Ethernet HWaddr 00:16:76:BC:7E:77 inet addr:192.168.0.221 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::216:76ff:febc:7e77/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:15496640 errors:0 dropped:0 overruns:0 frame:0 TX packets:19256813 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:836230629 (797.4 MiB) TX bytes:608496148 (580.3 MiB) Memory:dffe0000-e0000000

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  • In Icinga (Nagios), how do I configure hosts with multiple IPs?

    - by gertvdijk
    I'm setting up Icinga (Nagios fork) and I have some machines with multiple interfaces. Some services are only listening on one of them and to check them correctly, I like to know if it's possible to have multiple IP addresses configured for a single host in Icinga. Here's a minimal example: Remote Server: eth0: 1.2.3.4 (public IP) eth1: 10.1.2.3 (private IP, secure tunnel) Apache listening on 1.2.3.4:80. (public only) OpenSSH listening on 10.1.2.3:22. (internal network only) Postfix SMTP listening on 0.0.0.0:25 (all interfaces) Icinga Server: eth0: 10.2.3.4 (private IP, internet access) Now if I define a host: define host { use generic-host host_name server1 alias server1.gertvandijk.net address 10.1.2.3 } This will not check the HTTP status correctly. And defining an additional host: define host { use generic-host host_name server1-public alias server1.gertvandijk.net address 1.2.3.4 } will check everything, but shows up as two independent hosts. Now I want to 'aggregate' these two hosts to show up as a single host, yet providing an easy configuration to check the services on their proper address. What is the most elegant number-of-configuration-lines-saving solution to this? I read about several plugins available to workaround this, but I can't figure out what is the current way to address it. Solutions go back to 2003, but I'm running Icinga 1.7.1, already capable of the address6 option, yet that triggers IPv6-only resolving on the hostname... Ideally, I wish to configure Icinga to be intelligent enough to know that the Postfix instance running on 10.1.2.3:25 is the same as 1.2.3.4:25 and thus not triggering two alarms. I guess this must have been tackled before and sysadmins have it set up now. Please share your solution to this. Thanks! :)

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  • EXCEL workbook, intermitently, takes 30 seconds to load

    - by Julio Nobre
    I am trying to figure out why a simple .XLS EXCEL workbook is taking, randomly, 30 seconds to open. Before answering: Please, bear mind the following: Problem symptoms Hanging is intermitent and it takes exactly 30 seconds; During hanging there is no cpu or disk activity; It only happens during workbook load. Every runs smooth after that; Windows Explorer.exe hangs on folder, but all other folders, system and applications are still responsive; There are no consecutive hangings. I have to wait for while to reproduce this behaviour; All workbooks where located on a local drive (C:\BPI); The workbook has no macros and no addins; Office 2003 is being used for several years; The computer is running Windows XP; Computer has several network mapped drives, all addressed to main file server; Recently, main fileserver was replaced by Windows 2011 SBS Standard Edition What I have done so far I have traced machine Explorer.exe, using Process Monitor, added Duration column, and filtered by Duration 1. That's is how I found that hanging was taking exactly 30 seconds. For further information, please refer to Oliver Salzburg tutorial. Using Process Monitor, I have also figured out than five operations were taking most of sample collecting duration. Looking at sample image below, column Operation below you will notice that one single operation was taking 29 seconds; I have tried different workbooks (all of them smaller than 30 KB); I have, temporarily, removed all shortcuts on User Document's folder that were pointing to network drives or shares; I have runned CCleaner to fix registry issues; I made sure that there were no external links on tested workbooks; I have reproduced this behaviour for hours; I have extensivelly researched for hours on the web; Process Monitor's collected and filtered data

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  • Icinga/Nagios to ping different machine on local network

    - by feronovak
    I have 3 machines, all remote IPs and all of them running nsclient++ with remote and local IP addresses: 46.*.*.1/192.168.1.1 46.*.*.2/192.168.1.2 46.*.*.3/192.168.1.3 I want nagios/icinga to remotely ping other local machines to see whether VLAN is working correctly. Is there a way to tell nagios/icinga to use machine 192.168.1.1 and to ping 192.168.1.2 and 192.168.1.3 ? check_ping is pinging only machine defined in host_name from icinga server. Icinga is on completely different ip range 92.*.*.* Is there a way to do this to see VLAN workes fine?

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  • Comprehensive solution for managing patches, event viewing, change management, inventory, etc

    - by Holocryptic
    I'm looking for a solution that incorporates most or all of the following: Patch Management, Server event viewing/tracking, AD change management, ticketing and internal/external kb, remote access - ability to shadow user sessions or create new ones, imaging, and inventory. Our environments contains Windows Servers and ESXi Hosts (We're not completely virtual, but we're moving that direction). Various Cisco and Linksys switches and firewalls. This is a tall order, and I don't know if it can be done on a reasonable budget. I've looked and found some questions on SF that deal with some of this: http://serverfault.com/questions/72015/active-directory-management-tools-for-medium-sized-forest-less-than-1000-users http://serverfault.com/questions/4021/are-there-any-tools-to-do-change-management-with-active-directory-group-policy http://serverfault.com/questions/21752/what-is-a-good-patch-update-management-server What I'm ideally looking for is a reasonably cheap solution that integrates the features into a central interface. We're a non-profit, so money is a limiting factor (the cheaper, the better; but we have a max of $15k). What we are trying to avoid is having to deal with multiple vendors, while maintaining scalability (we're creating more sites that we'll have to manage). Is this possible, or will we have to cobble together something to make it work for us?

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  • obtaining nimbuzz server certificate for nmdecrypt expert in NetMon

    - by lurscher
    I'm using Network Monitor 3.4 with the nmdecrypt expert. I'm opening a nimbuzz conversation node in the conversation window and i click Expert- nmDecrpt - run Expert that shows up a window where i have to add the server certificate. I am not sure how to retrieve the server certificate for nimbuzz XMPP chat service. Any idea how to do this? this question is a follow up question of this one. Edit for some background so it might be that this is encrypted with the server pubkey and i cannot retrieve the message, unless i debug the native binary and try to intercept the encryption code. I have a test client (using agsXMPP) that is able to connect with nimbuzz with no problems. the only thing that is not working is adding invisible mode. It seems this is some packet sent from the official client during login which i want to obtain. any suggestions to try to grab this info would be greatly appreciated. Maybe i should get myself (and learn) IDA pro? This is what i get inspecting the TLS frames on Network Monitor: Frame: Number = 81, Captured Frame Length = 769, MediaType = ETHERNET + Ethernet: Etype = Internet IP (IPv4),DestinationAddress:[...],SourceAddress:[....] + Ipv4: Src = ..., Dest = 192.168.2.101, Next Protocol = TCP, Packet ID = 9939, Total IP Length = 755 - Tcp: Flags=...AP..., SrcPort=5222, DstPort=3578, PayloadLen=715, Seq=4101074854 - 4101075569, Ack=1127356300, Win=4050 (scale factor 0x0) = 4050 SrcPort: 5222 DstPort: 3578 SequenceNumber: 4101074854 (0xF4716FA6) AcknowledgementNumber: 1127356300 (0x4332178C) + DataOffset: 80 (0x50) + Flags: ...AP... Window: 4050 (scale factor 0x0) = 4050 Checksum: 0x8841, Good UrgentPointer: 0 (0x0) TCPPayload: SourcePort = 5222, DestinationPort = 3578 TLSSSLData: Transport Layer Security (TLS) Payload Data - TLS: TLS Rec Layer-1 HandShake: Server Hello.; TLS Rec Layer-2 HandShake: Certificate.; TLS Rec Layer-3 HandShake: Server Hello Done. - TlsRecordLayer: TLS Rec Layer-1 HandShake: ContentType: HandShake: - Version: TLS 1.0 Major: 3 (0x3) Minor: 1 (0x1) Length: 42 (0x2A) - SSLHandshake: SSL HandShake ServerHello(0x02) HandShakeType: ServerHello(0x02) Length: 38 (0x26) - ServerHello: 0x1 + Version: TLS 1.0 + RandomBytes: SessionIDLength: 0 (0x0) TLSCipherSuite: TLS_RSA_WITH_AES_256_CBC_SHA { 0x00, 0x35 } CompressionMethod: 0 (0x0) - TlsRecordLayer: TLS Rec Layer-2 HandShake: ContentType: HandShake: - Version: TLS 1.0 Major: 3 (0x3) Minor: 1 (0x1) Length: 654 (0x28E) - SSLHandshake: SSL HandShake Certificate(0x0B) HandShakeType: Certificate(0x0B) Length: 650 (0x28A) - Cert: 0x1 CertLength: 647 (0x287) - Certificates: CertificateLength: 644 (0x284) - X509Cert: Issuer: nimbuzz.com,Nimbuzz,NL, Subject: nimbuzz.com,Nimbuzz,NL + SequenceHeader: - TbsCertificate: Issuer: nimbuzz.com,Nimbuzz,NL, Subject: nimbuzz.com,Nimbuzz,NL + SequenceHeader: + Tag0: + Version: (2) + SerialNumber: -1018418383 + Signature: Sha1WithRSAEncryption (1.2.840.113549.1.1.5) - Issuer: nimbuzz.com,Nimbuzz,NL - RdnSequence: nimbuzz.com,Nimbuzz,NL + SequenceOfHeader: 0x1 + Name: NL + Name: Nimbuzz + Name: nimbuzz.com + Validity: From: 02/22/10 20:22:32 UTC To: 02/20/20 20:22:32 UTC + Subject: nimbuzz.com,Nimbuzz,NL - SubjectPublicKeyInfo: RsaEncryption (1.2.840.113549.1.1.1) + SequenceHeader: + Algorithm: RsaEncryption (1.2.840.113549.1.1.1) - SubjectPublicKey: - AsnBitStringHeader: - AsnId: BitString type (Universal 3) - LowTag: Class: (00......) Universal (0) Type: (..0.....) Primitive TagValue: (...00011) 3 - AsnLen: Length = 141, LengthOfLength = 1 LengthType: LengthOfLength = 1 Length: 141 bytes BitString: + Tag3: + Extensions: - SignatureAlgorithm: Sha1WithRSAEncryption (1.2.840.113549.1.1.5) - SequenceHeader: - AsnId: Sequence and SequenceOf types (Universal 16) + LowTag: - AsnLen: Length = 13, LengthOfLength = 0 Length: 13 bytes, LengthOfLength = 0 + Algorithm: Sha1WithRSAEncryption (1.2.840.113549.1.1.5) - Parameters: Null Value - Sha1WithRSAEncryption: Null Value + AsnNullHeader: - Signature: - AsnBitStringHeader: - AsnId: BitString type (Universal 3) - LowTag: Class: (00......) Universal (0) Type: (..0.....) Primitive TagValue: (...00011) 3 - AsnLen: Length = 129, LengthOfLength = 1 LengthType: LengthOfLength = 1 Length: 129 bytes BitString: + TlsRecordLayer: TLS Rec Layer-3 HandShake:

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  • I'd like to configure nagios to alerts only when there are no more mx servers available

    - by user37991
    In my company there are two redundant MX servers, I would like to tell nagios to wake me in the night ONLY if both servers are down. The default behavior is to alert whenever one of the MX servers is down. I would like to set a timeperiod i.e. 23:00 to 06:00 when nagios only alerts me by sms in case both servers are down. I am using nagios3 but I couldn't find something like this in the docs. Thanks

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  • Nagios: Which services should I monitor on different roles of servers?

    - by Itai Ganot
    I've started working in a new workplace and my first task is to build a Nagios server and configure it to monitor the servers in the network. Since I'm starting from scratch I wanted to hear from you, experienced users, which checks should I configure for each role? For example, there are some basic checks which I run on each Linux machine I monitor: SSH, Ping, Load, Current Users, Swap Usage, etc... Now my question is, which specific checks should I run for a DataBase server, for a Networking Switch, for Httpd servers? (I currently monitor how many httpd processes are running) Thanks in advance

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  • Unreceived SNMP traps

    - by Stephen Murby
    I have 2 CISCO IE3000 and 2 IE3010 switches. They are each configured to send traps to the one host which hosts my NMS [ManageEngine]. The only traps I have enabled on the switches are authentication and linkStatus messages (Up/Down), currently I have my NMS polling with the right community and receiving as ManageEngine checks when adding a managed device, but no linkStatus traps are received. I know they are coming because I have capture them with wireshark, but they are not received by my NMS, any ideas?

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  • OpenBSD has open ports in default installation

    - by celil
    I have been considering replacing Ubuntu with OpenBSD to improve the security on my local server. I need to have ssh access to it, and I also need it to serve static web content - so the only ports I need open are 22 and 80. However, when I scan my server for open ports after installing OpenBSD 4.8, and enabling ssh and http at /etc/rc.conf httpd_flags="" sshd_flags="" I discovered that it had several other open ports: Port Scan has started… Port Scanning host: 192.168.56.102 Open TCP Port: 13 daytime Open TCP Port: 22 ssh Open TCP Port: 37 time Open TCP Port: 80 http Open TCP Port: 113 ident ssh (22) and http (80) should be open as I enabled httpd and sshd, but why are the other ports open, and should I worry about them creating additional security vulnerabilities? Should they be open in a default installation?

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  • Nagios Availability Report plotting in Graphite

    - by Roman Zenka
    I would like to plot my Nagios availability reports over time. Does anyone know a plugin that would do so? I found 'graphios' at https://github.com/shawn-sterling/graphios that would plot extra data provided by plugins. What I need instead is a plugin that would plot information such as: 'the service was in ERROR state 0.5% of the time last week, while the week before it was 1%'. This would be useful for knowing whether the overall stability is getting better.

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  • Client-based program to track response time for online webservice

    - by Søren Haagerup
    I am helping a customer with general IT support, and they have a problem with a hosted web-based system being slow. The provider of the system blames the client's computer, and the client calls me for help. I blame the provider, but it is hard to get them to do something about it without rock-solid evidence. And every time the provider comes around for a TeamViewer session, everything of course runs smoothly. Does there exist a client program or browser plugin that tracks statistics about response time for specific web services?

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  • What info is really useful in my iptables log and how do I disable the useless bits?

    - by anthony01
    In my iptables rules files, I entered this at the end: -A INPUT -j LOG --log-level 4 --log-ip-options --log-prefix "iptables: " I DROP everything besides INPUT for SSH (port 22) I have a web server and when I try to connect to it through my browser, through a forbidden port number (on purpose), I get something like that in my iptables.log Sep 24 14:05:57 myserver kernel: [xx.xx] iptables: IN=eth0 OUT= MAC=aa:bb:cc SRC=yy.yy.yy.yy DST=xx.xx.xx.xx LEN=64 TOS=0x00 PREC=0x00 TTL=54 ID=59351 DF PROTO=TCP SPT=63776 DPT=1999 WINDOW=65535 RES=0x00 SYN URGP=0 Sep 24 14:06:01 myserver kernel: [xx.xx] iptables: IN=eth0 OUT= MAC=aa:bb:cc SRC= yy.yy.yy.yy DST=xx.xx.xx.xx LEN=48 TOS=0x00 PREC=0x00 TTL=54 ID=63377 DF PROTO=TCP SPT=63776 DPT=1999 WINDOW=65535 RES=0x00 SYN URGP=0 Sep 24 14:06:09 myserver kernel: [xx.xx] iptables: IN=eth0 OUT= MAC=aa:bb:cc SRC=yy.yy.yy.yy DST=xx.xx.xx.xx LEN=48 TOS=0x00 PREC=0x00 TTL=54 ID=55025 DF PROTO=TCP SPT=63776 DPT=1999 WINDOW=65535 RES=0x00 SYN URGP=0 Sep 24 14:06:25 myserver kernel: [xx.xx] iptables: IN=eth0 OUT= MAC=aa:bb:cc SRC=yy.yy.yy.yy DST=xx.xx.xx.xx LEN=48 TOS=0x00 PREC=0x00 TTL=54 ID=54521 DF PROTO=TCP SPT=63776 DPT=1999 WINDOW=65535 RES=0x00 SYN URGP=0 Sep 24 14:06:55 myserver kernel: [xx.xx] iptables: IN=eth0 OUT= MAC=aa:bb:cc SRC=yy.yy.yy.yy DST=xx.xx.xx.xx LEN=100 TOS=0x00 PREC=0x00 TTL=54 ID=35050 PROTO=TCP SPT=63088 DPT=22 WINDOW=33304 RES=0x00 ACK PSH URGP=0 Sep 24 14:06:55 myserver kernel: [xx.xx] iptables: IN=eth0 OUT= MAC=aa:bb:cc SRC=yy.yy.yy.yy DST=xx.xx.xx.xx LEN=52 TOS=0x00 PREC=0x00 TTL=54 ID=14076 PROTO=TCP SPT=63088 DPT=22 WINDOW=33264 RES=0x00 ACK URGP=0 Sep 24 14:06:55 myserver kernel: [xx.xx] iptables: IN=eth0 OUT= MAC=aa:bb:cc SRC=yy.yy.yy.yy DST=xx.xx.xx.xx LEN=52 TOS=0x00 PREC=0x00 TTL=54 ID=5277 PROTO=TCP SPT=63088 DPT=22 WINDOW=33248 RES=0x00 ACK URGP=0 Sep 24 14:06:56 myserver kernel: [xx.xx] iptables: IN=eth0 OUT= MAC=aa:bb:cc SRC=yy.yy.yy.yy DST=xx.xx.xx.xx LEN=100 TOS=0x00 PREC=0x00 TTL=54 ID=25501 PROTO=TCP SPT=63088 DPT=22 WINDOW=33304 RES=0x00 ACK PSH URGP=0 As you can see, I typed xx.xx.xx.xx:1999 in my browser, and it tried to connect until it timed out. 1) There are many similar lines for just one event. Do you think I need all of them? How would I avoid duplicates? 2) The last 4 lines are for my port 22. But since I allow port 22 INPUT for my web server, why are they here? 3) Do I need info like LEN,TOS,PREC and others? I'm trying to find a page that explains them one by one, by I can't find anything.

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  • Trying to make changes to the size of the events buffer in prelude-ids auditd plugin

    - by tharris
    I am running systems using the prelude-ids plugin for auditd. When the manager is up every thing works fine however I have a requirement that when the clients can't talk to the manager they should store no more than 250MB of messages, and when they hit that point they should start deleting the oldest events. All I can find is that audispd can be set to an overflow action of ignore,syslog,suspend,single, and halt none of which meet my requirement, and several of which I really cannot use. Does anyone know a way to do this? I know the events get stored in /var/spool/prelude/auditd/global, but I can't find anything about configuring how things are stored here. There are usually several files in the global directory but only 2 of them ever go above 0 in size, data0 and data0.journal.

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  • Software to monitor bill payment to mission critical IT service providers (ISP, DNS etc.)

    - by Sholom
    Hi All, The Problem: Our very likable but absent minded bookkeeper keeps neglecting to pay our IT vendors on time. Just this past week our internet service was disconnected. Same could happen to many other mission critical accounts (domain registrar, backup MX, anti-virus license, HackerSafe (McAfee secure) service and even an 800 number to name a few). As the sysadmin, i monitor my severs to make sure they are plugged into the power-outlet. I believe i should also monitor my services to make sure they are plugged in to their money-outlet. To compound the problem, when the power goes out someone else will likely notice and notify me. But if a bill is not payed, no one will ever notice until service is lost. Lost as in losing our domain name which would cause a lot more damage then the power failing on our server. [Solution] = [Doesn't work because]: Retrain the bookkeeper = Wishful thinking. Notify my manager = Already have (via email). Protects me, does not solve problem. Fire bookkeeper = What makes you so sure the next one will never forget? Bottom line: Humans are humans and sooner or later something critical will be royally messed up. We need to partner with a machine to help us out here. Anybody have the same problem? What software/solution do you use? I would like software that emails me when a bill is passed due just like i get an email when the power outlet fails. Anyone hear of anything like that? Thanks

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  • Employee Tracking: Is there a similar software to Elance WorkView or oDesk "Team Room"?

    - by Kunal
    We are looking for a great commercial or free tool which can monitor all our remote employees and keep the reports centrally. We need it similar to Elance WorkView or oDesk "Team Room", what these tools do is: Take screenshots at random interval. Track the activity on computer based on key strokes. (not a necessity) It doesn't necessarily need to track time but will be good to have, our aim is to monitor employees and make sure they're working - that's all. I'll give oDesk Team Room 10/10 and I haven't been able to find such tool. Is there anyone who can suggest such tool? Thanks

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  • Very high memory usage, but not claimed by any process?

    - by SharkWipf
    While stress-testing LVM on one of our Debian servers, I came across this issue where memory would fill up a lot to the point where it would run the server out of memory, but no process would claim the memory. See http://i.imgur.com/cLn5ZHS.png, and see http://serverfault.com/a/449102/125894 for an explanation on the colors used in htop. Why is this happening? And is there any way to see what process is using the memory? Htop is configured not to hide any processes, so what is it that htop is missing? In this particular case, I can fairly certainly say that it is caused, directly or indirectly, by lvmcreate, lvmremove or dmsetup, as I was stress-testing that. Do note that this question is not about solving the LVM problem, but about why the memory isn't claimed by any process. Stopping all LVM commands does bring the memory back down to <600MB.

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