I'm trying to learn how to backup and restore my Ubuntu Server via tar so I know that I have a safe system. After I untar and reboot, I have several issues, but they seem to be caused by a read-only file system. The source and destination server are both Ubuntu Server on the same version, 18.04.05 LTS. The source server is a VPS that has 6 GB RAM and 4vCPUs. The destination server is a VM on my FreeNAS machine with 6GB RAM and 2 vCPUs.
The primary applications that need to work are my Graylog server and Nagios server. I've mostly followed the instructions at Ubuntu.
First, my tar command is:
sudo tar -c --use-compress-program=pigz -f backup.tar.gz --exclude=/backup.tar.gz --exclude=/dev --exclude=/usr --exclude=/sbin --exclude=/proc --exclude=/sys --exclude=/tmp --exclude=/run --exclude=/mnt --exclude=/media --exclude=/lost+found --exclude=/home/*/.cache --exclude=/home/*/.gvfs --exclude=/home/*/.local/share/Trash --exclude=/var/log --exclude=/var/cache/apt/archives --exclude=/usr/src/linux-headers* --one-file-system /
I use pigz to utilize the VPS's 4 vCPUs to take less time. I transfer this to my VM which as a fresh copy of Ubuntu Server 18.04.05 and untar with:
sudo tar -xvpzf backup.tar.gz -C / --numeric-owner
After I reboot, I get the following as soon as I boot:
Unable to setup logging. [Errno 30] Read-only file system: '/var/log/landscape/sysinfo.log'
run-parts: /etc/update-motd.d/50-lanscape-sysinfo exited with return code 1
mktemp: failed to create file via template '/var/lib/update-notifier/tmp.XXXXXXXXXX': Read-only file system
run-parts: /etc/update-motd.d/95-hwe-eol exited with return code 1
/usr/lib/update-notifier/update-motd-fsck-at-reboot: 33: /usr/lib/update-motd-fsck-at-reboot: cannot create /var/lib/update-notifier/fsck-at-reboot: Read-only file system
I do see that some areas of the system do work like the original source. My SSH port changes, hostname changes, etc. But I get these above errors and my Graylog and Nagios servers do not work.
So I'm wondering where I went wrong in my process and any help would be appreciated. The source is a live server with backups so I'm safe there. I'm just making sure I have my ducks in a row for the future.
I am trying to start minishift on my machine. It successfully creates minishift VM but throws time out error.
Configuration:
Minishift version: v1.34.0+f5db7cb
OS: Windows 10
Hypervisor: Virtual Box v6.0.10
PS C:\WINDOWS\system32> minishift start
-- Starting OpenShift cluster .......................................................................Error during 'cluster up' execution: Error starting the cluster. ssh command error:
command : /var/lib/minishift/bin/oc cluster up --image 'openshift/origin-${component}:v3.11.0' --public-hostname 192.168.99.100 --routing-suffix 192.168.99.100.nip.io --base-dir /var/lib/minishift/base
err : exit status 1
output : Getting a Docker client ...
Checking if image openshift/origin-control-plane:v3.11.0 is available ...
Pulling image openshift/origin-cli:v3.11.0
E0725 17:15:42.919928 5316 helper.go:173] Reading docker config from /home/docker/.docker/config.json failed: open /home/docker/.docker/config.json: no such file or directory, will attempt to pull image docker.io/openshift/origin-cli:v3.11.0 anonymously
Image pull complete
E0725 17:15:44.643860 5316 helper.go:173] Reading docker config from /home/docker/.docker/config.json failed: open /home/docker/.docker/config.json: no such file or directory, will attempt to pull image docker.io/openshift/origin-node:v3.11.0 anonymously
Pulling image openshift/origin-node:v3.11.0
Pulled 5/6 layers, 85% complete
Pulled 6/6 layers, 100% complete
Extracting
Image pull complete
Checking type of volume mount ...
Determining server IP ...
Using public hostname IP 192.168.99.100 as the host IP
Checking if OpenShift is already running ...
Checking for supported Docker version (=>1.22) ...
Checking if insecured registry is configured properly in Docker ...
Checking if required ports are available ...
Checking if OpenShift client is configured properly ...
Checking if image openshift/origin-control-plane:v3.11.0 is available ...
I0725 17:16:20.775520 5316 config.go:40] Running "create-master-config"
Starting OpenShift using openshift/origin-control-plane:v3.11.0 ...
I0725 17:16:31.108342 5316 config.go:46] Running "create-node-config"
I0725 17:16:35.237968 5316 flags.go:30] Running "create-kubelet-flags"
I0725 17:16:36.785234 5316 run_kubelet.go:49] Running "start-kubelet"
I0725 17:16:37.288388 5316 run_self_hosted.go:181] Waiting for the kube-apiserver to be ready ...
E0725 17:21:37.300062 5316 run_self_hosted.go:571] API server error: Get https://192.168.99.100:8443/healthz?timeout=32s: dial tcp 192.168.99.100:8443: connect: connection refused ()
Error: timed out waiting for the condition
Expected result: It should provide me without errors link to open web console
This happens to me sometimes too.
Solutions include:
minishift stop && minishift start (turn it off and on again)
restart Windows (perhaps VBox has corrupted itself again)
More info on my minishift setup is here:
http://divby0.blogspot.com/2019/07/configuring-minishift-for-use-with.html
For what it's worth I use a combination of linux shells in Windows 10 to interact with minishift / docker daemon:
Git Bash (usually the best)
Docker Toolbox (plan B when something won't run in Git Bash shell)
WSL (ubuntu based, plan C in desperation)
We have one redhat linux enterprise 7.0 server.
I installed Apache 2.4.6 (last version) on this server.
Once i check the version of apache with apachectl -v command on the server terminal, i am getting below result and it is ok.
But when i tried same command from a different machine by using SSH Secure Shell, i am getting no result from this (apachectl -v) command as shown below.
What is the problem here? Is there any SSH setting regarding this command? We need to run apachectl -v command from SSH-Outside.
Thanks for your help..
So after restarting my httpd redis crashed (due to the number of sudden requests sent via httpd and written on redis) and now when I try to restart redis on my centos 6.5 server I get the following error:
[root#host /]# /usr/sbin/redis-server restart
[1705] 17 Apr 00:30:49 # Fatal error, can't open config file 'restart'
I have also tried to login to redis using redis-cli and I get an error stating the connection to the server failed.
What options do I have to safely restart the server?
From the /src directory where you downloaded and unzipped your redis source, run the following. This is for RHEL based systems.
make install
# (OR)
sudo cp src/redis-server /usr/local/bin/
sudo cp src/redis-cli /usr/local/bin/
In my Rails Project, I am trying to run two different servers at different port. But it fails by giving this error at console.
C:\Rails>rails s
=> Booting Mongrel
=> Rails 3.1.1 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
A server is already running. Check C:/Rails/tmp/pids/server.pid.Exiting
Please check the updated answer.
After googling a lot, I just delete that file and restart the server. Then again system create that file, then again I delete that file. Now Server is running fine. And System generates another copy at the same place. But it is running well.
DELETE THAT FILE ....
If you want to run two servers then it may again create trouble. So
Both commands are checking the default PID file location (tmp/pids/server.pid), so you're seeing this error. Try running multiple servers like so:
Server 1: bundle exec rails s
Server 2: bundle exec rails s -p 3001 -P tmp/pids/server2.pid
Credit: https://stackoverflow.com/a/14446920/1376448
Thanks
UPDATE after Connor Leech comment about Forman Gem
Foreman can help manage multiple processes that your Rails app depends
upon when running in development. It also provides an export command
to move them into production.
You can use netstat to know which process is holding the rails webserver, then you can kill the pid and start it over again, assuming that for some weird reason the server is not responding or running in background and you don't find another way to restart it..
netstat -plntu | grep 3000
tcp 0 0 0.0.0.0:3000 0.0.0.0:* LISTEN 7656/ruby
The last column shows the PID and the process name, then you only need to do:
kill -9 7656
and rails s to get it working again...
Hope it's useful
I find myself coming back to this webpage a lot to find the lsof -wni tcp:3000 command so I've found this method to be easier.
If you get this message:
A server is already running. Check /Users/username/project/tmp/pids/server.pid.
Exiting
And if you're running on a unix system (mac or linux) you can run these commands:
$ cat /Users/username/project/tmp/pids/server.pid
# output
71030
# Kill the process
$ kill -9 71030
Then run your server again!
I deleted the file with cd'ing in to the tmp directory then removing the file
rm server.pid
Then I restarted the server and I got this error
Exiting/Users/josephmellin/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/socket.rb:206:in `bind': Address already in use - bind(2) for 0.0.0.0:3000 (Errno::EADDRINUSE)
Then I could use the following command to see which process is running.
sudo lsof -iTCP -sTCP:LISTEN -P | grep :3000
And after I entered my password, I got this resoponse
ruby 2786 josephmellin 12u IPv4 0xfeadd8ae849eaec9 0t0 TCP *:3000 (LISTEN)
And then killed the process with the following command
KILL -9 2786
And then restarted the server (you will have a different number than 2786 - I left it here for demo purposes)
Step 1: remove .pid
C:/Rails/tmp/pids/server.pid.Exiting
# IN linux/unix shell
$ rm -rf <path to file>
Sometime this doesn't solve the problem, then you have to kill the process running by localhost, for such cases, follow STEP 2
STEP 2: List the process for localhost and kill it
# For Linux/Unix shell
$ lsof -wni tcp:3000
# output
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
ruby 5946 rails 11u IPv4 79073 0t0 TCP *:3000 (LISTEN)
ruby 5946 rails 12u IPv4 103786 0t0 TCP 127.0.0.1:3000->127.0.0.1:53612 (ESTABLISHED)
# Kill the running process
$ kill -9 5946
run your server again
rails server
ps aux | grep rails
or
bundle exec rails s -p 3001 -P tmp/pids/server2.pid
Every instance of a RoR server creates a PID file. By default it is
#{Rails.root}/tmp/pids/server.pid
and if that file already exists it will refuse to start a new server.
To run more than one server of the same project on the same machine you should manually specify the PID file name for each instance of the server (I recommend simply appending a hyphen and the port number) using the -P option:
rails s -p 1234 -P tmp/pids/server-1234.pid
I'm told in some cases you may need to supply a full (rather than relative) path, but I don't know what those cases are.
You can see the PID for each proccess(the first column) :
ps vax | grep rails
// OR: ps auxw | grep rails
5236 pts/1 Sl+ 1:46 2 0.2 /usr/bin/ruby1.9.1 script/rails s -p 3001
5298 pts/2 Sl+ 0:12 2 0.7 /usr/bin/ruby1.9.1 script/rails s -p 3003
7356 pts/5 Sl+ 0:09 2 0.9 /usr/bin/ruby1.9.1 script/rails s -p 3002
7846 pts/3 Sl+ 0:19 2 1.7 /usr/bin/ruby1.9.1 script/rails s
Then kill the server:
kill -9 <pid>
To kill all running apps with "rails" in the name:
killall -9 rails
Use rails default commands, for example:
rake tmp:clear
Works for me, and really simple. ;)
single line command, that will take care of it.
kill -9 $(more C:/Rails/tmp/pids/server.pid)
I just had this problem, just deleted server.pid file and server works fine!
Remove that file: C:/Rails/tmp/pids/server.pid
A simpler way in which I found lesser commands . Go to the path which says a server is running in your folder structure . Search for the file. On the file itself shows a number which is the process id that is currently running. Lets say if the number is 'x', then simply type this command into your terminal
kill -9 x
However, note that this works in Ubuntu. Not sure, if it works in other OS as well.
Try to change the number in the pid file to another and save it.