Questions[ubuntu-14.04](server)

Very unexpected, but briefly if i run a docker container host becomes unresponsive, no in/out, can't ping it, only hard reboot works.

DMESG, sys and kernel logs doesn't show anything obvious

Heuristic diagnosis tells me it crashes when my client terminal kicking docker hibernates...

It's very fuzzy, but maybe someone experienced something similar?

host spec:

Intel(R) Atom(TM) CPU  Z3735F @ 1.33GHz

ubuntu version

~$ uname -a
Linux raccoon 3.16.0-30-generic #40~14.04.1-Ubuntu SMP Thu Jan 15 17:43:14 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

docker -v

Docker version 1.9.1, build a34a1d5

Correction: response time (%D) is μs not ms! 1

This doesn't change anything about the weirdness of this pattern but it means that it is practically way less devastating.

Why is response time inversely correlated to request frequency?

Shouldn't the server respond faster when it is less busy handling requests?

Any suggestion how to make Apache "take advantage" of less load?

This pattern is periodic. That means it will show up if impressions drop below about 200 requests per minute - which happens (due to natural user-activity) from late night to early morning.

The requests are very simple POSTs sending a JSON of less than 1000 characters - this JSON is stored (appended to a text file) - that's it. The reply is just "-".

The data shown in the graphs was logged with Apache itself:

LogFormat "%{%Y-%m-%d+%H:%M:%S}t %k %D %I %O" performance
CustomLog "/var/log/apache2/performance.log" performance

How does one get the version of Logstash?

root@elk:/usr/share/elasticsearch# bin/logstash --help
bash: bin/logstash: No such file or directory

I have Logstash running on my system. Also.

root@elk:/# logstash -V
bash: logstash: command not found

Also.

root@elk:/# ps aux | grep logstash
logstash  1725 45.3  8.5 1942860 175936 ?      SNl  22:03   0:35 /usr/bin/java -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -Djava.awt.headless=true -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -XX:+HeapDumpOnOutOfMemoryError -Djava.io.tmpdir=/opt/logstash -Xmx500m -Xss2048k -Djffi.boot.library.path=/opt/logstash/vendor/jruby/lib/jni -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -Djava.awt.headless=true -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -XX:+HeapDumpOnOutOfMemoryError -Djava.io.tmpdir=/opt/logstash -XX:HeapDumpPath=/opt/logstash/heapdump.hprof -Xbootclasspath/a:/opt/logstash/vendor/jruby/lib/jruby.jar -classpath : -Djruby.home=/opt/logstash/vendor/jruby -Djruby.lib=/opt/logstash/vendor/jruby/lib -Djruby.script=jruby -Djruby.shell=/bin/sh org.jruby.Main --1.9 /opt/logstash/lib/bootstrap/environment.rb logstash/runner.rb agent -f /etc/logstash/conf.d -l /var/log/logstash/logstash.log
root      1777  0.0  0.0   8860   636 ?        S+   22:05   0:00 grep --color=auto logstash

More.

root@elk:/opt/logstash/bin# ls
logstash  logstash.bat  logstash.lib.sh  plugin  plugin.bat  rspec  rspec.bat  setup.bat
root@elk:/opt/logstash/bin# logstash -V
bash: logstash: command not found

I am running ubuntu 14 on one of my servers.

When I run sudo apt-get update, I get the error below.

W: GPG error: http://cran.rstudio.com trusty/ Release: The following signatures were invalid: KEYEXPIRED 1445181253 KEYEXPIRED 1445181253 KEYEXPIRED 1445181253

Should I modify my ppa repository list or take some other action to fix this issue.

Update: I tried removing R from the server using

sudo apt-get --purge remove r-base
sudo apt-get --purge remove r-base-core
sudo apt-get --purge remove r-base-recommended

However, I am still seeing the same issue with apt-get update.

I have a clean VPS, with Ubuntu 14.04 LTS x64. And Tried the following:

# Upgrade The Base Packages

apt-get update
apt-get upgrade -y

# Add A Few PPAs To Stay Current

apt-get install -y software-properties-common

apt-add-repository ppa:nginx/stable -y
apt-add-repository ppa:rwky/redis -y
apt-add-repository ppa:chris-lea/node.js -y
apt-add-repository ppa:ondrej/php5-5.6 -y

But then it fails at the last one:

root@xxx:~# apt-add-repository ppa:ondrej/php5-5.6 -y

gpg: keyring `/tmp/tmp9jdzm9kw/secring.gpg' created
gpg: keyring `/tmp/tmp9jdzm9kw/pubring.gpg' created
gpg: requesting key E5267A6C from hkp server keyserver.ubuntu.com
gpg: /tmp/tmp9jdzm9kw/trustdb.gpg: trustdb created
gpg: key E5267A6C: public key "Launchpad PPA for Ond\xc5\x99ej Sur�" imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.4/threading.py", line 920, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.4/threading.py", line 868, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 687, in addkey_func
    func(**kwargs)
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 370, in add_key
    return apsk.add_ppa_signing_key()
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 261, in add_ppa_signing_key
    tmp_export_keyring, signing_key_fingerprint, tmp_keyring_dir):
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 210, in _verify_fingerprint
    got_fingerprints = self._get_fingerprints(keyring, keyring_dir)
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 202, in _get_fingerprints
    output = subprocess.check_output(cmd, universal_newlines=True)
  File "/usr/lib/python3.4/subprocess.py", line 605, in check_output
    output, unused_err = process.communicate(inputdata, timeout=timeout)
  File "/usr/lib/python3.4/subprocess.py", line 936, in communicate
    stdout = _eintr_retry_call(self.stdout.read)
  File "/usr/lib/python3.4/subprocess.py", line 487, in _eintr_retry_call
    return func(*args)
  File "/usr/lib/python3.4/encodings/ascii.py", line 26, in decode
    return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc5 in position 92: ordinal not in range(128)

I couldn't figure out whats wrong. It's all pretty basic.