Scripts & HOWTOs – Page 30

Under some circumstances it is not posible to remove cluster services from a node. To completely remove the cluster config you can execute the following from the commandline.

cluster node  /forcecleanup

MSCLUSTER Manually Destroy Cluster Config Read More »

Netwerk IPv4 Subnetting

2008-05-15 / Other / Tim van Kooten Niekerk

max aantal subnetten: 2^n (-2) // n = aantal masked bits *subnet* mask
max aantal hosts in subnet = 2^n -2 // n = ongemaskeerde bits

next multiple of 8 = next mult. of 8 greater or eq. to CIDR netmask not.
interesting value = (next multiple of 8) / 8

incremental value = 2^ (next multiple of 8 - CIDR netmask notation)

bijv. 192.168.10.50/27:
incremental value = 2^(32-27) = 2^5 = 32
interesting value = 32 / 8 = 4
netwerkadressen: 192.168.10.0, 192.168.10.32, 192.168.10.64, enz.
broadcastadressen: 192.168.10.31, 192.168.10.63, 192.168.10.95, enz.
netwerk 192.168.10.32
broadcast 192.168.1.63 (192.168.10.(64-1))

bijv. 10.6.127.255/14:
incremental value: 2^(16-14) = 2^2 = 4
interesting value = 16 / 8 = 2
netwerkadres: 10.4.0.0
broadcast: 10.7.255.255 ( 10.(8.0.0-1)

Netwerk IPv4 Subnetting Read More »

OpenSSL Certificate Commands & Examples

2008-05-15 / GNU/Linux / Tim van Kooten Niekerk

Below script creates al selfgesigned certificate from a private key and removes the password from the key so you can you can use the key-pair in Apache.

# Create Key and Certificate Signing Request (option -des3 creates a triple des encrypted key)...
openssl genrsa -des3 -out server.key 4096
openssl req -new -key server.key -out server.csr

# Remove password from key and sign certificate with key... 
cp server.key server.key.org
openssl rsa -in server.key.org -out server.key
openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt

# Re-encrypt private key...
openssl rsa -des -in server.key.org -out server.key
openssl rsa -aes256 -in server.key.org -out server.key

For ease you can add all key and signing options to a config file. This way you can also add a subjectAlternate to the certificate.

>openssl req -new -config server.cnf -key server.key -out server.csr

# server.cnf #
[ req ]
default_bits = 4096
prompt = no
encrypt_key = no
distinguished_name = dn
req_extensions = req_ext

[ dn ]
C = NL
O = Totietoot
CN = examplefqdn.totietoot.nl

[ req_ext ]
subjectAltName = DNS:examplefqdn.totietoot.nl, DNS:examplealtname.totietoot.nl

Use the following command to convert the key-pair to pkcs12 format.

openssl pkcs12 -export -in server.crt -inkey server.key [-name tomcat] -out server.p12 -CAfile chain.pem -caname root -chain

Convert pkcs12 file to java keystore (jks):

keytool -importkeystore -deststorepass <password> -destkeypass <password> -destkeystore server.jks -srckeystore server.p12 -srcstoretype PKCS12 -srcstorepass <password> -alias <name>

Decode a certificate request or a x509 certificate:

openssl req -in server.csr -noout -text
openssl x509 -in server.crt -noout -text

Convert a PFX file to PEM-format (single file)…

openssl pkcs12 -in server.pfx -out key-n-certs.pem -nodes

Check certificate and connection using openssl…

openssl s_client -showcerts -connect f.q.d.n:1234
openssl s_client -starttls smtp -showcerts -connect f.q.d.n:25 -servername f.q.d.n

Convert certificate (PEM) to public key…

openssl x509 -inform pem -in certificate.cer -pubkey -noout > pubkey.pem

Add a (CA) certificate to the JAVA CACerts certificate truststore…

"C:\Java\jdk1.8.0_121\bin\keytool" -import -alias ADCERT-CA-1 -keystore "C:\Java\jdk1.8.0_121\jre\lib\security\cacerts" -trustcacerts -file ADCERT-CA-1.cer

OpenSSL Certificate Commands & Examples Read More »