Shaun's Wiki

Because SSH is incredible.

# Using connect-proxy as a socks proxy (tunneling ssh over http proxy to an ssh server on port 1.2.3.4:443)
Host 1.2.3.4
  ProxyCommand connect-proxy -H proxy:3128 %h %p
  Port 443
  User shaun
 
# -W can be used for raw port-forwarding on OpenSSH 5.4 and higher
Host internal.server
  HostName internal.server.com
  User shaun
  ProxyCommand ssh shaun@intermediary.server.com -W %h:%p
 
# Here's the old way, with netcat
Host internal.server
  HostName internal.server.com
  User shaun
  ProxyCommand ssh shaun@intermediary.server.com nc %h %p
 
# New to OpenSSH 7.3 and higher is the ProxyJump commmand, which does the same, but with multiple possible intermediaries
Host internal.server
   HostName internal.server.com
   ProxyJump shaun@intermediary1.server:22,shaun@intermediary2.server:22
   User shaun

ssh -NTCf -w 0:0 <destination>
 
# Machine A
ip link set tun0 up
ip addr add 10.0.0.100/32 peer 10.0.0.200 dev tun0
 
# Machine B
ip link set tun0 up
ip addr add 10.0.0.200/32 peer 10.0.0.100 dev tun0
 
# Add a route for target network on Machine B
ip route add 10.0.0.0/24 via 10.0.0.200
 
#This allows us to send packets from Machine B to any IP address on Network A, via Machine A. 
#To ensure that packets have a route back to Machine B add an arp entry on Machine A:
 
arp -sD 10.0.0.200 eth0 pub
 
#This sets a published arp destination for 10.0.0.200 to Machine A (proxy-ARP). 
 
# Kernel packet forwarding must be enabled for the routing bits
echo 1 | sudo tee /proc/sys/net/ipv4/ip_forward

ssh-copy-id -i .ssh/id_rsa.pub user@server.com

xfs
ext4 recovery

dmidecode --type 17

Sample output:

# dmidecode 2.12
SMBIOS 2.7 present.
 
Handle 0x003B, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x002C
        Error Information Handle: Not Provided
        Total Width: 72 bits
        Data Width: 64 bits
        Size: 32 GB
        Form Factor: DIMM
        Set: None
        Locator: D0
        Bank Locator: /SYS/MB/P0
        Type: DDR3
        Type Detail: Synchronous
        Speed: 1066 MHz
        Manufacturer: Samsung
        Serial Number: 366112E5
        Asset Tag:
        Part Number: M393B4G70BM0-YH9
        Rank: 1
        Configured Clock Speed: 1066 MHz

openssl x509 -in certificate.crt -out certificate.pem -outform PEM

openssl x509 -noout -text -in server.crt
openssl rsa -noout -text -in server.key

The `modulus' and the `public exponent' portions in the key and the Certificate must match. But since the public exponent is usually 65537 and it's bothering comparing long modulus you can use the following approach:

openssl x509 -noout -modulus -in server.crt | openssl md5
openssl rsa -noout -modulus -in server.key | openssl md5

openssl req -noout -modulus -in server.csr | openssl md5

openssl s_client -showcerts -servername www.virtualhost.co.za -connect localhost:443 </dev/null | openssl x509 -text

echo FakeProcName > /tmp/cmdline
mount -n --bind -o ro /tmp/cmdline /proc/<pid>/cmdline
 
ps -ef | grep FakeProcName

curl -s https://raw.githubusercontent.com/sivel/speedtest-cli/master/speedtest.py | python -

For Unbreakable Enterprise Kernel:

export DLP="https://oss.oracle.com/ol7/debuginfo"
wget ${DLP}/kernel-uek-debuginfo-`uname -r`.rpm
wget ${DLP}/kernel-uek-debuginfo-common-`uname -r`.rpm

For Red Hat Compatible Kernel:

export DLP="https://oss.oracle.com/ol7/debuginfo"
wget ${DLP}/kernel-debuginfo-`uname -r`.rpm
    # wget ${DLP}/kernel-debuginfo-common-`uname -r`.rpm

Install

rpm -Uhv kernel-uek-debuginfo-4.1.12-112.14.15.el7uek.x86_64.rpm \
	 kernel-uek-debuginfo-common-4.1.12-112.14.15.el7uek.x86_64.rpm

Oracle Enterprise Linux