kunwei2005

openssl rsa -in id_rsa -outform pem > id_rsa.pem openssl rsa -in id_rsa -pubout -out id_rsa.pub.pem openssl dgst -sha256 -sign ~/.ssh/id_rsa.pem -out signature.data message openssl dgst -sha256 -verify ~/.ssh/id_rsa.pub.pem -signature signature.data  message

download/install geth from  https://github.com/ethereum/go-ethereum/wiki/Installation-instructions-for-Windows setup private net jason file under ~/.privether, an example of privategenesis.json {   "nonce": "0x00006d6f7264656e",   "difficulty": "0x000002",   "mixhash": "0x00000000000000000000000000000000000000647572616c65787365646c6578",   "coinbase": "0x0000000000000000000000000000000000000000",   "timestamp": "0x00",   "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",   "extraData": "0x",   "gasLimit": "0x2FEFD8",   "config": {         "chainId": 15,         "homesteadBlock": 0,         "eip155Block": 0,         "eip158Block": 0   },   "alloc": {     "cd2a3d9f938e13cd947ec05abc7fe734df8dd826": { "b...

first install and start docker sudo yum -y install docker docker-registry [osboxes@osboxes ~]$ sudo systemctl enable docker.service [osboxes@osboxes ~]$ sudo systemctl start docker.service [osboxes@osboxes ~]$ sudo systemctl status docker.service install based on  https://dcos.io/docs/1.8/administration/installing/custom/gui/ if you meet permission issue, you need disable selinux [osboxes@osboxes ~]$ cat /etc/sysconfig/selinux # This file controls the state of SELinux on the system. # SELINUX= can take one of these three values: #     enforcing - SELinux security policy is enforced. #     permissive - SELinux prints warnings instead of enforcing. #     disabled - No SELinux policy is loaded. SELINUX=disabled # SELINUXTYPE= can take one of three two values: #     targeted - Targeted processes are protected, #     minimum - Modification of targeted policy. Only selected processes are protected. ...

following the guide at  https://mesos.apache.org/gettingstarted/ if you met the following issue, need hack it to change the Version: 2012d to 2012 in file pytz-2012d-py2.7.egg-info pkg_resources.VersionConflict: (pytz 2012d (/usr/lib/python2.7/site-packages), Requirement.parse('pytz>=2010')) python examples runs ok with mesos 1.0.1 /home/osboxes/mesos/build/3rdparty/setuptools-20.9.0/pkg_resources/__init__.py:1268: UserWarning: /home/osboxes/.python-eggs is writable by group/others and vulnerable to attack when used with get_resource_filename. Consider a more secure location (set with .set_extraction_path or the PYTHON_EGG_CACHE environment variable).   warnings.warn(msg, UserWarning) I1031 02:04:19.299875 13734 sched.cpp:226] Version: 1.0.1 I1031 02:04:19.312309 13773 sched.cpp:330] New master detected at master@10.88.48.57:5050 I1031 02:04:19.313021 13773 sched.cpp:341] No credentials provided. Attempting to register without authentication I1031 02:04:19.322...

following the guide at  https://mesos.apache.org/gettingstarted/ , it seems mesos-slave.sh need creating folder with root permission to allow examples to run, and needs start with sudo otherwise the c++/java examples will fail. output from failed c++/java examples I1027 09:53:10.901875  6181 sched.cpp:222] Version: 0.28.2 I1027 09:53:10.935006  6190 sched.cpp:326] New master detected at master@10.88.48.57:5050 I1027 09:53:10.936367  6190 sched.cpp:336] No credentials provided. Attempting to register without authentication I1027 09:53:10.948501  6190 sched.cpp:703] Framework registered with 8cab08a7-fac7-440b-8933-0d329da29d7c-0001 Registered! ID = 8cab08a7-fac7-440b-8933-0d329da29d7c-0001 Received offer 8cab08a7-fac7-440b-8933-0d329da29d7c-O1 with cpus: 1.0 and mem: 6609.0 Launching task 0 using offer 8cab08a7-fac7-440b-8933-0d329da29d7c-O1 Status update: task 0 is in state TASK_FAILED Aborting because task 0 is in unexpected state TASK_FAILED ...

you can download centos image from http://www.osboxes.org/centos/ once centos running, by default its network is off. enable the network by clicking the right upper corner settings. now run the following commands with root sudo yum install epel-release sudo yum install dkms sudo yum groupinstall "Development Tools" sudo yum install kernel-devel sudo yum install kernel-headers reboot click device > install guest additions cd images, and restart again. the screen resolution will be adjusted to fit. if you meet errors such as "your kernel headers for kernel cannot be found...", please go to /usr/src/kernels, and rename the kernel folder name to match exactly the version under /lib/modules

The MacBook Pro 15" comes with native high resolution 1680X1050, with tiny system fonts. You can lower the resolution with the compromise of fuzzy fonts. There is one approach can be taken similar to Windows DPI adjustment. This is called HiDPI. You need install XCode, and use Guartz Debug to enable HiDPI. It does something magic, but very limited. On MacBook Pro, I can only get 840X525 in HiDPI. Correction : You don't need install XCode, simply install Graphics Tools for XCode will do. It can be downloaded from Apple Developer site.