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  • a safer no password sudo?

    - by Stacia
    Ok, here's my problem - Please don't yell at me for being insecure! :) This is on my host machine. I'm the only one using it so it's fairly safe, but I have a very complex password that is hard to type over and over. I use the console for moving files around and executing arbitrary commands a LOT, and I switch terminals, so sudo remembering for the console isn't enough (AND I still have to type in my terrible password at least once!) In the past I have used the NOPASSWD trick in sudoers but I've decided to be more secure. Is there any sort of compromise besides allowing no password access to certain apps? (which can still be insecure) Something that will stop malware and remote logins from sudo rm -rf /-ing me, but in my terminals I can type happily away? Can I have this per terminal, perhaps, so just random commands won't make it through? I've tried running the terminal emulations as sudo, but that puts me as root.

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  • Spambot Infection Detection

    - by crankshaft
    My server has been blocked by CBL for participating in curtwail spambot. Initially we suspected that it was coming from a PC and not from the server, but the router is blocking all packets on 25 except those coming from the server. I have just executed the tcpdump command and every 5 minutes I see a flurry of activity on port 25 that is very suspicious and I am sure that there is some process running on the server: 13:02:30.027436 IP exprod5og110.obsmtp.com.53803 > ubuntu.local.smtp: Flags [S], seq 171708781, win 5744, options [mss 1436,sackOK,TS val 3046699707 ecr 0,nop,wscale 2], length 0 I have stopped postfix, and yet there is still traffic on port 25 above. But how can I find what process is actually communicating on port 25 as it only rund for a few seconds and so for example lsof -i :25 will never catch it. I have been working on this now for 2 days, it is a live server and I cannot simply shut it down, any suggestion on how I can detect the source of this email bot process ?

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  • Do control groups improve system performances?

    - by qdii
    According to this website, enabling cgroups in the kernel can boost performances by sharing resources in a better way. In particular, the conclusion states that:  Nevertheless, with a little trial and error, cgroups can help you improve the efficiency of your systems’ resource usage and avoid downtime due to overusage of a single service. Kernel seeds, however, recommend to deactivate them altogether. They say: Consider these [kernel] settings poison. They remain nothing but system slow-downs. They are all off by default [in the proposed kernel config file]. Who should I trust?

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  • I've two swap partitions, how can i delete one?

    - by Gp2mv3
    I've installed Ubuntu on my computer but I did a mistake during the installation and it created two swap's. In fact I had tree partitions (system, home, swap) but the installator crashed so I restarted the installation and it has installed everything in the system partition. So now I separated the home in the appropriate partition but I've two swap partitions. How can I delete one ? If I delete one, how will it go ?

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  • Automate Restart Of Solr

    - by Brain Buddies
    I have 3 instance of solr running using tomcat (in shell u will find something like -Dcatalina.base=/usr/local/apache-tomcat-6.0.35 -) suing tomcat_1 (in shell u will find something like -Dcatalina.base=/usr/local/apache-tomcat-6.0.35_1 -) using tomcat_2 (in shell u will find something like -Dcatalina.base=/usr/local/apache-tomcat-6.0.35_2 -) Can i write a shell script which can kill the particular instance for 1 : kill tomcat but not tomcat_1 & tomcat_2 for 2 : kill tomcat_1 but not tomcat & tomcat_2 for 3 : kill tomcat_2 but not tomcat & tomcat_1

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  • How can I get the comment of the current authorized_keys ssh key ?

    - by krosenvold
    Edit: What I really need to know WHICH ssh key from authorized_keys has been used to identify the currently logged on user. According to "man sshd": Protocol 2 public key consist of options, keytype, base64-encoded key, comment. I see that when I use ssh-keygen, the comment is usually the local identity of the user. Is there any way to access this value when I'm on the remote computer ? (Kind of like the SSH_CLIENT shell variable) (Assuming I enforce the comment to be a remote identity of some sort, I would like to log this from a shell-script! This is on ubuntu)

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  • How do I create yum repo file?

    - by max
    I know there is a previously asked question, but I still have some doubts so asking again. How do I create a yum repo file? I know that in the /etc/yum.repos.d/ I have to create .repo file. Below is the pattern: 1 [name ] 2 name= 3 baseurl= 4 enabled=1 5 gpgcheck=1 6 gpgkey= Here in the baseurl which link should I give? I'm fully confused about this. How do I get that baseurl link? Can anyone please explain to me clearly? I am using CentOS 6.2.

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  • Problems using "at" with Apache

    - by Alex Padgett
    I'm trying to use a PHP script to create at jobs, but when it comes time to execute the jobs, nothing seems to be happening. I've tried to output any errors to log files, but have had no luck. It seems obvious that it's a permissions issue, because when I set apache to run as my personal user, everything works fine. However, when I exec wget directly from PHP, everything works fine so it seems that apache has the correct permissions to use it. The problem appears to be when using at in conjunction with apache. So I need to find a way to make this work with apache running as its own user. Here is the command I'm using: echo "wget -qO- http://example.com/" | at now + 1 minute 2>&1 Any ideas? EDIT: Apache can create the at jobs, it just seems that when they execute nothing is happening.

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  • How do I enable subfolders in Dovecot?

    - by yarun can
    In the past I was able to drag and drop my folder with subfolders (local emails) into my imap accounts inside Thunderbird. Now I moved to my own vps and its running Dovecot. So far so good with emails. Today I wanted to copy some folders with messages again but I realized that it does not let me copy to folders. I can drag and drop individual emails into some folders in Imap however folders stuff does not work. I am not sure what this feature is called. The previous email servers might be using some other imap server so I am really not sure what it might be even called. Is this a Dovecot or Thundenbird thing? If it is a Dovecot feature how I enable it on my server? Dovecot is running on Debian Wheezy 64 bit vps thanks

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  • How to jump back to the first character in *nix command line?

    - by clami219
    When writing a long command in the *nix command line and having to go back to the first character, in order to add something at the beginning (for instance a nohup, when you realize the process will be a long one, or a sudo, when you realize you need root permissions) it can take a long time for the cursor to make its way back to the first character... Is there a short cut that allows you to jump straight there? I'm using a mac, so Home is not an option

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  • Howto setup a `veth` virtual network

    - by Reinder
    I'd like to setup three virtual network interfaces (veth) which can communicate with each other. To simulate a three node cluster, each program then binds to one veth interface. I'd like to do it without LXC if possible. I tried using: Created three veth pairs: sudo ip link add type veth Created a bridge sudo brctl addbr br0 Added one of each pair to the bridge: sudo brctl addif br0 veth1 sudo brctl addif br0 veth3 sudo brctl addif br0 veth5 Configured the interfaces: sudo ifconfig veth0 10.0.0.201 netmask 255.255.255.0 up sudo ifconfig veth2 10.0.0.202 netmask 255.255.255.0 up sudo ifconfig veth4 10.0.0.203 netmask 255.255.255.0 up Then I verified if is works using: ping -I veth0 10.0.0.202 but it doesn't :( The I added IP addresses to the veth1,veth3,veth5 and br0 interfaces in the 10.0.1.x/24 range. But that doesn't help. Any ideas? or a guide, all I find in how to use it with LXC. Or am I trying something that isn't possible?

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  • What is the procedure to replace a failing hard drive in a RAID array?

    - by slayton
    3 years ago a co-worker setup a software RAID-6 array on Ubuntu 9.04 and I'm getting messages from the OS that the drive has bad sectors and should be replaced. I'd like to remove this drive and replace it with a new drive, however, I have never done this before and I'm terrified that in the process of fixing the array I'm going to end up ruining it. I know the device ID of the array and I know the device IDs of the individual drives in the array. Additionally I physically have the bad drive. What are the steps to replace the bad drive with a new drive and get the array running again?

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  • Ignore Apache Default Server?

    - by Jakobud
    I run several vhosts on our Apache server. Whenever browse the server using either it's IP address or some other name that resolves to that address, but where a virtual host entry doesn't exist for that address I get the generic Apache test page: I want to change the server so I can specify a Virtual Host to see by default instead of the Apache Default Server page. I don't want to just modify the Default Server page either. I just need to be able to specify a Virtual Host to use instead. I added the following Virtual Host: <VirtualHost _default_:*> DocumentRoot /vhosts/default/public </VirtualHost> What I am reading is supposed to take priority over all other Virtual Hosts as the default. But this doesn't seem to take priority over the Apache Default Server/Host. What do I need to do here?

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  • Formatting LVM partition with HFS+

    - by Pyetras
    I've already tried fsck.hfsplus from hfsprogs, which doesn't do anything at all, and gparted (doesn't work with LVM). Are there any other ways to do that? If all else fails I have OSX install DVD, but I'm not sure if its installer would see a LVM partition (and running it just to check that would be quite troublesome, as I don't have a DVD drive ATM).

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  • How to change default user (ubuntu) via CloudInit on AWS

    - by Gui Ambros
    I'm using CloudInit to automate the startup of my instances on AWS. I followed the (scarce) documentation available at http://bazaar.launchpad.net/~cloud-init-dev/cloud-init/trunk/annotate/head%3A/doc/examples/cloud-config.txt and examples on /usr/share/doc/cloud-init, but still haven't figured out how to change the default username (ubuntu, id:1000). I know I can create a script to manually delete the default ubuntu and add my user, but seems counter intuitive given that CloudInit exist exactly to automate the initial setup. Any ideas?

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  • Disaster - partitions lost, data seemingly alive, how to recover?

    - by a2h
    I've used TestDisk and it's written my old partition structure of a ~20GiB partition for Vista, ~25GiB partition for 7 (but it now shows up as unallocated) and a ~400GiB partition for documents. What it's meant to be is a 30GiB partition for 7, some unallocated space, and a ~400GiB partition for documents. So currently, I have access to all my documents, but not any of the programs I've installed on C:, or AppData, because my boot partition is now supposedly a 20GB vista partition. I've tried using my Windows 7 install disc's repair function, but that did nothing beyond wasting about 10 minutes of my time. I'm currently posting from an Ubuntu live CD. Any help?

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  • SSH not working after installing SVN server on Debian

    - by sLIDe
    Today I had to install SVN server on my Debian server. I used this tutorial (only I didn't do anything to connect to SVN through file://, http:// or https://, only svn:// and svn+ssh://). After I installed SVN server and configured it after that tutorial, I tried to connect to it. I could connect to it using svn:// protocol, but when I tried to connect using svn+ssh:// protocol, my servers SSH stopped responding. Even after I stopped SVN server and restarted SSH server I can't connect to it.

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  • merge pieces of file together

    - by veilig
    I have a directory tree of files I need to loop through and reformat the lines. can I do this with sed with some combination of find? for each file, I'll need to adjust the text in the file from ... * @category Foo * @package Bar ... into just this (Remove the @category line, but prepend the value to the package annotation value) ... * @package Foo/Bar ... what is the most efficient way of doing this? its a few hundred files that will be modified.

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  • Client unable to reach Internet through OpenVPN

    - by Carroarmato0
    The clients can all connect through OpenVPN. OpenVPN serves the following pool: server 10.8.0.0 255.255.255.0 I've configured the server's iptable with the following rule: iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE and echo 1 /proc/sys/net/ipv4/ip_forward This used to work back on the old vps I used. Now I've migrated to a vps which has ipv6 connectivity. Is it possible that Ipv6 has something to do with the fact that the clients can't reach the internet?

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  • Proper way to configure ~/.Xsession with a standalone window manager to gracefully end a session

    - by cYrus
    I'm using xdm and my ~/.Xsession looks like this: # <initialization stuff here> exec openbox It works, but I've noticed that when I log out Openbox doesn't gracefully kill all the applications. In particular Google Chrome complains about that. How can I make sure to wait for all processes to exit (just like others configurations: Gnome, KDE, Windows ...)? The only (ugly) solution that I've found involves sleep and kill into ~/.Xsession.

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  • how to know which display number for the variable DISPLAY to be exported when ssh to server

    - by insidepower
    When i ssh to server using -X, i always confuse about which display number i should export. It seems to me sometimes the display number has been used by something, so what i can do is only export DISPLAY=localhost:0 && xclock export DISPLAY=localhost:1 && xclock export DISPLAY=localhost:2 && xclock export DISPLAY=localhost:... until the clock appear. Then i will use that display number. Each time log in to the server, the display number which is able to tunnel the gui data correct would be different. I know many of such similar questions has been asked and answer. However I couldn't find answer to my question, anyone know about it? Thanks!

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