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1500 questions
128
votes
4 answers
How can I see Time-To-Live (TTL) for a DNS record?
I would like to see the Time-To-Live (TTL) value for a CNAME record.
I have access to dig (on Apple Mac OS X), which gives me an answer like this:
% dig host.example.gov
<*SNIP*>
;; ANSWER SECTION:
host.example.gov. 43200 IN CNAME …
Stefan Lasiewski
- 23,975
- 42
- 135
- 187
127
votes
10 answers
Can you run Docker natively on the new Windows 10 (Ubuntu) bash userspace?
My understanding was that the primary limitation of running docker on other OSs was the Linux Network containers that made it possible. (Certainly for Macs).
Recently Microsoft announced a beta of a Ubuntu linux user mode running natively on…
Hawkeye
- 2,739
127
votes
23 answers
How to recover from "Too many Authentication Failures for user root"
I've done several attempts to establish SSH-connecton for user root@host using putty terminal. While doing so I specified wrong credentials several times and after that I've specified them correctly, and then after the credentials were accepted the…
user11722
- 1,433
127
votes
18 answers
How do you increase a KVM guest's disk space?
I setup an Ubuntu guest on a CentOS KVM host with initially 6GB of disk space. How do I go about increasing the Ubuntu guest's disk space from the command line?
EDIT #1: I'm using a disk image file (qemu).
slm
- 7,730
126
votes
6 answers
Postfix - how to retry delivery of mail in queue?
I have a backup mail server in case of a failure on the main one.
In that case of failure, mails come on the backup server and stay there until the main one is back.
If I wait some times, the delivery will be done automatically as soon as the main…
Nicolas
- 1,269
126
votes
3 answers
How can I show user's privileges in MySQL?
I know that I can set user's privileges in the following simple way:
grant all on [database name].[table name] to [user name]@[host name];
But how can I see existing privileges?
I need to see data similar to those which are used in grant. In other…
Roman
- 2,619
124
votes
4 answers
How do I auto-start docker containers at system boot?
What is a good way to automatically start docker containers when the system boots up?
Is there a preferred way to do this on Ubuntu 14.04?
I've used supervisord in the past to auto start web apps. But that doesn't feel like the right thing for…
Stefan Arentz
- 1,350
124
votes
16 answers
Nginx 1 FastCGI sent in stderr: “Primary script unknown”
My first time using Nginx, but I am more than familiar with Apache and Linux. I am using an existing project and when ever I am trying to see the index.php I get a 404 File not found.
Here is the access.log entry:
2013/06/19 16:23:23 [error] 2216#0:…
We0
- 1,439
124
votes
5 answers
What is this IP address: 169.254.169.254?
I have always noticed an IP something "169.254.x.x" in my routing table even when I am not connected to any network in my Windows operating system.
In Linux, when I list my routing table.
$ ip route show
I get an entry like
169.254.0.0/16 dev eth0…
pradeepchhetri
- 2,828
124
votes
5 answers
How do you do load testing and capacity planning for web sites?
This is a canonical question about capacity planning for web sites.
Related:
Can you help me with my capacity planning?
How do you do load testing and capacity planning for databases?
What are some recommended tools and methods of capacity…
gWaldo
- 11,987
124
votes
7 answers
How does CTRL-ALT-DEL to log in make Windows more secure?
When logging into Windows, it says on that page that CTRL-ALT-DEL somehow makes Windows more secure. I have never been able to figure a mechanism where having to press some specific key combination before logging in makes the system more secure. I…
Eddie
- 11,492
124
votes
8 answers
How can I kill all stopped jobs?
When I try to exit from my Linux server I get the message:
There are stopped jobs.
: Is there a single command to kill these?
yazz.com
- 7,483
124
votes
7 answers
How to change an EC2 instance's security group
I have created a new EC2 instance. It got assigned the default security group. I want to change that security group. How?
user35042
- 2,711
124
votes
8 answers
Can I make `find` return non-0 when no matching files are found?
Even when /tmp has no file called something, searching for it with find will return 0:
$ find /tmp -name something
$ echo $?
0
How can I get a non-zero exit status when find does not find anything?
yael
- 1,439
123
votes
8 answers
Is it possible to rerun kubernetes job?
I have the following Kubernetes Job configuration:
---
apiVersion: batch/v1
kind: Job
metadata:
name: dbload
creationTimestamp:
spec:
template:
metadata:
name: dbload
spec:
containers:
- name: dbload
image:…
Bostone
- 1,363
- 2
- 9
- 8