scicco

cd /etc/yum.repos.d/
wget http://archive.cloudera.com/gplextras5/redhat/6/x86_64/gplextras/cloudera-gplextras5.repo
yum check-update
yum install -y hadoop-lzo
dd if=/dev/random of=/tmp/test.bin bs=1000k count=10
su - hdfs
hbase org.apache.hadoop.hbase.util.CompressionTest /tmp/test.bin lzo
echo "remember to restart all services on the node to take effect"

scicco

#!/bin/sh -x
#
# found here: http://askubuntu.com/a/592127
#
cd /usr/lib/vmware-tools/modules/source
tar xf vmhgfs.tar
grep -q d_u.d_alias vmhgfs-only/inode.c && echo "already patched" && exit 0
sed -i -e s/d_alias/d_u.d_alias/ vmhgfs-only/inode.c
cp -p vmhgfs.tar vmhgfs.tar.orig
tar cf vmhgfs.tar vmhgfs-only

scicco

# found here:
# http://stackoverflow.com/a/28680027/1488217

set_trace_func proc {
  |event, file, line, id, binding, classname| 
  if event == "call"  && caller_locations.length > 500
    fail "stack level too deep"
  end
}

scicco

#USE THIS INSIDE RAILS CONSOLE
cursor = 0
items = []
while(cursor != -1)
  result = $redis.scan(cursor, match: "sidekiq:sidekiq:status*")
  cursor = result[0].to_i
  items += result[1]
  puts cursor
  if cursor == 0
    cursor = -1

scicco

---
  - name: Remove ipv6 hosts entry
    replace:
      dest: /etc/hosts
      regexp: '^.*::\d\t.+|.*IPv6.*$'
      #backup: yes
    become: yes
# TODO FIND A WAY TO ELIMINATE EMPTY ROWS INSIDE /etc/hosts file
  - name: Find ipv6 kernel parameter
    shell: sysctl --all | egrep '^net.ipv6\..*disable' | awk '{print $1}'

scicco

---
#taken from here: https://github.com/68b32/ansible-role-mariadb/blob/7d01b08146c185064eb5c9d1b65b0f07c0e5eaee/tasks/mysql_secure_installation.yml
#
# Set root password
# UPDATE mysql.user SET Password=PASSWORD('mysecret') WHERE User='root';
# FLUSH PRIVILEGES;

- name: Set root user password
  # If .my.cnf already exists, this will cause an mysql-root-password update.
  mysql_user:

scicco

#!/bin/bash
/etc/init.d/nginx stop
certbot renew --dry-run
certbot renew
cd <THE_FOLDER_WITH_CERTIFICATES>
openssl rsa -in privkey.pem -out privkey-rsa.pem
/etc/init.d/nginx configtest
/etc/init.d/nginx start
/etc/init.d/nginx status

scicco

cat log/capistrano.log | egrep "^.+Command:\s(.+)$" | cut -d : -f 2 > log/capistrano_deploy_commands.log

scicco

#!/bin/sh -e

# found here: https://notes.tweakblogs.net/blog/7955/using-netcat-to-build-a-simple-tcp-proxy-in-linux.html

if [ $# != 3 ]
then
    echo "usage: $0 <src-port> <dst-host> <dst-port>"
    exit 0
fi

scicco

#found here: https://stackoverflow.com/a/22540192/1488217

# comment out the original line
# [ -z "$PS1" ] && return

if [ -z "$PS1" ]; then
  shopt -s expand_aliases
  # alias ls='ls --color=always'
  # return
fi