Google Nexus 4: permanent back panel glass repair for less than a penny

Clear packing tape. Apply single layer everywhere on back panel there isn't a device port. Be creative.

Has worked for me for months to prevent further damage.

Cost less than $ 0.01.

Doesn't look "pro" but neither do $20 - $30 covers from Toys-R-Us and other similar stores.

I actually only covered the area below the camera and to the left of the speak/microphone/whatever with one single piece I had to cut a bit to size.

Cassandra: links to snapshots in one place

Use rsync with '-L' to copy elsewhere.

#!/usr/bin/ruby

require 'fileutils'

mybasedir = '/var/lib/cass'
mydatadir = mybasedir + '/data'
mysnapshotlinksdir = mybasedir + '/snapshots'
FileUtils.remove_dir(mysnapshotlinksdir) if File.exists?(mysnapshotlinksdir)
Dir.chdir mydatadir
mysnapshotdirs = Dir.glob("**/*/")
mysnapshotdirs = mysnapshotdirs.grep(/snapshots\/.+/)
#p mysnapshotdirs

mysnapshots = {}
mysnapshotdirs.each do |mydir|
    mysnapshot = {}
    myparts = mydir.split('/')
    mysnapshot['keyspace'] = myparts[0]
    mysnapshot['cf'] = myparts[1]
    mysnapshot['tag'] = myparts[3]
    mysnapshot['linkdir'] = [mysnapshotlinksdir, mysnapshot['tag'], mysnapshot['keyspace']].join('/')
    mysnapshot['link'] = [mysnapshotlinksdir, mysnapshot['tag'], mysnapshot['keyspace'], mysnapshot['cf']].join('/')
    mysnapshot['target'] = [mydatadir, mydir].join('/')
    #p mysnapshot
    FileUtils.mkpath mysnapshot['linkdir'] unless File.exists?(mysnapshot['linkdir'])
    File.symlink(mysnapshot['target'], mysnapshot['link']) unless File.symlink?(mysnapshot['link'])
end

Encrypt one directory with password, reboots hide files

See: encfs

Plenty of guides online.

Mount read-only a Linux ext3/ext4 partition from within Mac OS

http://diesistmein.name/?p=30

or some variation.

Might help: http://osxdaily.com/2014/03/20/mount-ext-linux-file-system-mac/

OpenVPN version 2.3.2: using new easyrsa mechanism for multiple users

1. Server setup
1. ./easyrsa init-pki
1. don't do this twice!
2. ./easyrsa build-ca
2. User key and cert signing request on complete separate machine
1. ./easyrsa init-pki
1. don't do this twice!
2. ./easyrsa gen-req myuser
3. Server signs user cert req
1. ./easyrsa import-req myuser.req myuser
2. ./easyrsa sign-req client myuser

Generate your server key and cert in a similar manner to a user.

Any client with a signed cert may connect to the server. There is no record of the client cert on the server itself; since the server signed the user cert, that is authority enough to validate the user cert.

Only if a user cert needs to be revoked, is a "revocation file" created on the server; this revocation file disallows that user from connecting. If no users need to be revoked, nothing needs to be done, nothing needs to exist about users on the server-side.

https://community.openvpn.net/openvpn/wiki/EasyRSA3-OpenVPN-Howto

Very fast editing over sshfs

Update: this can cause some of your ssh sessions to hang, so be aware of that.

Add this to your ~/.ssh/config

Host myserver.mydomain.com
  ControlMaster auto
  ControlPath /tmp/%r@%h:%p

Then, say you have root access via your ssh pub key

mkdir tmp001
sshfs -o uid=1000 root@myserver.mydomain.com:/var/www tmp001

Now, the files in tmp001 map to your remote /var/www directory. And access to them uses an ssh session that is maintained in your /tmp directory, i.e. all interactions are performed over the same ssh session.

To see the tmp file, if you just opened the sshfs session in the last 10 mins

find /tmp -mmin -10 -ls

AWS cli: rework EBS volume on AMI launch: switch to SSD, "delete on termination" to true

aws
    ec2
        run-instances
            --image-id
                ami-aaaaaa
            --instance-type
                hi1.4xlarge
            --security-group-ids
                sg-eeeeeeee
            --subnet-id
                subnet-cccccccc
            --block-device-mappings
                '[
                    {
                        "DeviceName":"/dev/sdb",
                        "VirtualName":"ephemeral0"
                    },
                    {
                        "DeviceName":"/dev/sdc",
                        "VirtualName":"ephemeral1"
                    },
                    {
                        "DeviceName":"/dev/sdd",
                        "Ebs":
                        {
                            "SnapshotId":"snap-6",
                            "VolumeType":"gp2",
                            "DeleteOnTermination":"true"
                        }
                    }
                ]'
            --region
                us-east-1

Switch to high IOPS

aws
    ec2
        run-instances
            --image-id
                ami-aaaaaa
            --instance-type
                hi1.4xlarge
            --security-group-ids
                sg-eeeeeeee
            --subnet-id
                subnet-cccccccc
            --block-device-mappings
                '[
                    {
                        "DeviceName":"/dev/sdb",
                        "VirtualName":"ephemeral0"
                    },
                    {
                        "DeviceName":"/dev/sdc",
                        "VirtualName":"ephemeral1"
                    },
                    {
                        "DeviceName":"/dev/sdd",
                        "Ebs":
                        {
                            "SnapshotId":"snap-6",
                            "VolumeType":"io1",
                            "Iops":4000,
                            "DeleteOnTermination":"true"
                        }
                    }
                ]'
            --region
                us-east-1