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1500 questions
74
votes
9 answers

How passively monitor for tcp packet loss? (Linux)

How can I passively monitor the packet loss on TCP connections to/from my machine? Basically, I'd like a tool that sits in the background and watches TCP ack/nak/re-transmits to generate a report on which peer IP addresses "seem" to be experiencing…
nonot1
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74
votes
9 answers

Is there a way to avoid SSH typing delay?

Can I tell SSH to send the data only after pressing enter or tab, and not after each individual keypress?
StackedCrooked
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74
votes
3 answers

How do I connect to ssh with a different public key?

I have two public keys, one for some servers and one for others. How do I specify which key to use when connecting to a server?
rid
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74
votes
16 answers

Why Block Port 22 Outbound?

I'm a programmer, and I have worked for a few clients whose networks block outgoing connections on port 22. Considering that programmers often need to use port 22 for ssh, this seems like a counterproductive procedure. At best, it forces the…
runako
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74
votes
2 answers

Multiple public keys for one user

This question is similar to SSH public key authentication - can one public key be used for multiple users? but it's the other way around. I'm experimenting on using ssh so any ssh server would work for your answers. Can I have multiple public keys…
Russell
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74
votes
13 answers

ZFS vs XFS

We're considering building a ~16TB storage server. At the moment, we're considering both ZFS and XFS as filesystem. What are the advantages, disadvantages? What do we have to look for? Is there a third, better option?
Tamas Czinege
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74
votes
12 answers

Do you have any useful awk and grep scripts for parsing apache logs?

I can use log analyzers, but often I need to parse recent web logs to see what's happening at the moment. I sometimes do things like to figure out top 10 ips that request a certain file cat foo.log | grep request_to_file_foo | awk '{print $1}' | …
deadprogrammer
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73
votes
6 answers

Why are CA root certificates all SHA-1 signed (since SHA-1 is deprecated)?

I understand that SSL certs cannot be signed using SHA-1 anymore. Yet, all CA root certificates are SHA-1 signed (mostly). Does it mean the same algorithm that is no longer trusted for "you grandma SSL shop" is fine for the uttermost top secured…
131
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73
votes
4 answers

failed to get D-Bus connection: Operation not permitted

I'm trying to list services on my CentOS image running in Docker using systemctl list-units but I get this error message: Failed to get D-Bus connection: Operation not permitted Any suggestions what the problem might be?
Snowcrash
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73
votes
5 answers

Which OS is running in my Docker container?

Most of the time, using one of these two, I can tell which OS is running in my Docker container (alpine, centOS, etc) But this time, I can't tell: bash-4.2$ uname -a Linux 6fe5c6d1451c 2.6.32-504.23.4.el6.x86_64 #1 SMP Tue Jun 9 20:57:37 UTC…
Bob Yoplait
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73
votes
2 answers

Create a directory under /var/run at boot

I had a daemon that needed its own dir in /var/run for its PID file with write permission granted to the daemon's user. I found I could create this dir with these commands: # mkdir /var/run/mydaemon Then I could change its ownership to the…
user24601
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73
votes
8 answers

Route 53 doesn't allow adding DKIM keys because length is too long

Here is how I enter the value for DKIM key: "v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwztXzIUqic95qSESmnqX U5v4W4ENbciFWyBkymsmmSNOhLlEtzp/mnyhf50ApwCTGLK9U7goo/ijX/wr5roy…
Gasim
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73
votes
5 answers

The right way to keep docker container started when it used for periodic tasks

I have docker container with installed and configured software. There is no any programm supposed to be started/runned all the time. What I want - its ability to start some command depending on external events. like: docker exec mysupercont…
Korjavin Ivan
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73
votes
8 answers

Is STARTTLS less safe than TLS/SSL?

In Thunderbird (and I assume in many other clients, too) I have the option to choose between "SSL/TLS" and "STARTTLS". As far as I understand it, "STARTTLS" means in simple words "encrypt if both ends support TLS, otherwise don't encrypt the…
Foo Bar
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73
votes
3 answers

What is the difference between unlink and rm?

Is unlink any faster than rm?
Marcin
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